printk: move to separate directory for easier modification

Make it easier to break up printk into bite-sized chunks.

Remove printk path/filename from comment.

Signed-off-by: Joe Perches <joe@perches.com>
Cc: Samuel Thibault <samuel.thibault@ens-lyon.org>
Cc: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 2924 deletions

diff --git a/kernel/printk.c b/kernel/printk.c
deleted file mode 100644
index 69b0890ed7e5..000000000000
--- a/kernel/printk.c
+++ /dev/null
@@ -1,2924 +0,0 @@
-/*
- *  linux/kernel/printk.c
- *
- *  Copyright (C) 1991, 1992  Linus Torvalds
- *
- * Modified to make sys_syslog() more flexible: added commands to
- * return the last 4k of kernel messages, regardless of whether
- * they've been read or not.  Added option to suppress kernel printk's
- * to the console.  Added hook for sending the console messages
- * elsewhere, in preparation for a serial line console (someday).
- * Ted Ts'o, 2/11/93.
- * Modified for sysctl support, 1/8/97, Chris Horn.
- * Fixed SMP synchronization, 08/08/99, Manfred Spraul
- *     manfred@colorfullife.com
- * Rewrote bits to get rid of console_lock
- *	01Mar01 Andrew Morton
- */
-
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/tty.h>
-#include <linux/tty_driver.h>
-#include <linux/console.h>
-#include <linux/init.h>
-#include <linux/jiffies.h>
-#include <linux/nmi.h>
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/interrupt.h>			/* For in_interrupt() */
-#include <linux/delay.h>
-#include <linux/smp.h>
-#include <linux/security.h>
-#include <linux/bootmem.h>
-#include <linux/memblock.h>
-#include <linux/aio.h>
-#include <linux/syscalls.h>
-#include <linux/kexec.h>
-#include <linux/kdb.h>
-#include <linux/ratelimit.h>
-#include <linux/kmsg_dump.h>
-#include <linux/syslog.h>
-#include <linux/cpu.h>
-#include <linux/notifier.h>
-#include <linux/rculist.h>
-#include <linux/poll.h>
-#include <linux/irq_work.h>
-#include <linux/utsname.h>
-
-#include <asm/uaccess.h>
-
-#define CREATE_TRACE_POINTS
-#include <trace/events/printk.h>
-
-/* printk's without a loglevel use this.. */
-#define DEFAULT_MESSAGE_LOGLEVEL CONFIG_DEFAULT_MESSAGE_LOGLEVEL
-
-/* We show everything that is MORE important than this.. */
-#define MINIMUM_CONSOLE_LOGLEVEL 1 /* Minimum loglevel we let people use */
-#define DEFAULT_CONSOLE_LOGLEVEL 7 /* anything MORE serious than KERN_DEBUG */
-
-int console_printk[4] = {
-	DEFAULT_CONSOLE_LOGLEVEL,	/* console_loglevel */
-	DEFAULT_MESSAGE_LOGLEVEL,	/* default_message_loglevel */
-	MINIMUM_CONSOLE_LOGLEVEL,	/* minimum_console_loglevel */
-	DEFAULT_CONSOLE_LOGLEVEL,	/* default_console_loglevel */
-};
-
-/*
- * Low level drivers may need that to know if they can schedule in
- * their unblank() callback or not. So let's export it.
- */
-int oops_in_progress;
-EXPORT_SYMBOL(oops_in_progress);
-
-/*
- * console_sem protects the console_drivers list, and also
- * provides serialisation for access to the entire console
- * driver system.
- */
-static DEFINE_SEMAPHORE(console_sem);
-struct console *console_drivers;
-EXPORT_SYMBOL_GPL(console_drivers);
-
-#ifdef CONFIG_LOCKDEP
-static struct lockdep_map console_lock_dep_map = {
-	.name = "console_lock"
-};
-#endif
-
-/*
- * This is used for debugging the mess that is the VT code by
- * keeping track if we have the console semaphore held. It's
- * definitely not the perfect debug tool (we don't know if _WE_
- * hold it are racing, but it helps tracking those weird code
- * path in the console code where we end up in places I want
- * locked without the console sempahore held
- */
-static int console_locked, console_suspended;
-
-/*
- * If exclusive_console is non-NULL then only this console is to be printed to.
- */
-static struct console *exclusive_console;
-
-/*
- *	Array of consoles built from command line options (console=)
- */
-struct console_cmdline
-{
-	char	name[8];			/* Name of the driver	    */
-	int	index;				/* Minor dev. to use	    */
-	char	*options;			/* Options for the driver   */
-#ifdef CONFIG_A11Y_BRAILLE_CONSOLE
-	char	*brl_options;			/* Options for braille driver */
-#endif
-};
-
-#define MAX_CMDLINECONSOLES 8
-
-static struct console_cmdline console_cmdline[MAX_CMDLINECONSOLES];
-static int selected_console = -1;
-static int preferred_console = -1;
-int console_set_on_cmdline;
-EXPORT_SYMBOL(console_set_on_cmdline);
-
-/* Flag: console code may call schedule() */
-static int console_may_schedule;
-
-/*
- * The printk log buffer consists of a chain of concatenated variable
- * length records. Every record starts with a record header, containing
- * the overall length of the record.
- *
- * The heads to the first and last entry in the buffer, as well as the
- * sequence numbers of these both entries are maintained when messages
- * are stored..
- *
- * If the heads indicate available messages, the length in the header
- * tells the start next message. A length == 0 for the next message
- * indicates a wrap-around to the beginning of the buffer.
- *
- * Every record carries the monotonic timestamp in microseconds, as well as
- * the standard userspace syslog level and syslog facility. The usual
- * kernel messages use LOG_KERN; userspace-injected messages always carry
- * a matching syslog facility, by default LOG_USER. The origin of every
- * message can be reliably determined that way.
- *
- * The human readable log message directly follows the message header. The
- * length of the message text is stored in the header, the stored message
- * is not terminated.
- *
- * Optionally, a message can carry a dictionary of properties (key/value pairs),
- * to provide userspace with a machine-readable message context.
- *
- * Examples for well-defined, commonly used property names are:
- *   DEVICE=b12:8               device identifier
- *                                b12:8         block dev_t
- *                                c127:3        char dev_t
- *                                n8            netdev ifindex
- *                                +sound:card0  subsystem:devname
- *   SUBSYSTEM=pci              driver-core subsystem name
- *
- * Valid characters in property names are [a-zA-Z0-9.-_]. The plain text value
- * follows directly after a '=' character. Every property is terminated by
- * a '\0' character. The last property is not terminated.
- *
- * Example of a message structure:
- *   0000  ff 8f 00 00 00 00 00 00      monotonic time in nsec
- *   0008  34 00                        record is 52 bytes long
- *   000a        0b 00                  text is 11 bytes long
- *   000c              1f 00            dictionary is 23 bytes long
- *   000e                    03 00      LOG_KERN (facility) LOG_ERR (level)
- *   0010  69 74 27 73 20 61 20 6c      "it's a l"
- *         69 6e 65                     "ine"
- *   001b           44 45 56 49 43      "DEVIC"
- *         45 3d 62 38 3a 32 00 44      "E=b8:2\0D"
- *         52 49 56 45 52 3d 62 75      "RIVER=bu"
- *         67                           "g"
- *   0032     00 00 00                  padding to next message header
- *
- * The 'struct log' buffer header must never be directly exported to
- * userspace, it is a kernel-private implementation detail that might
- * need to be changed in the future, when the requirements change.
- *
- * /dev/kmsg exports the structured data in the following line format:
- *   "level,sequnum,timestamp;<message text>\n"
- *
- * The optional key/value pairs are attached as continuation lines starting
- * with a space character and terminated by a newline. All possible
- * non-prinatable characters are escaped in the "\xff" notation.
- *
- * Users of the export format should ignore possible additional values
- * separated by ',', and find the message after the ';' character.
- */
-
-enum log_flags {
-	LOG_NOCONS	= 1,	/* already flushed, do not print to console */
-	LOG_NEWLINE	= 2,	/* text ended with a newline */
-	LOG_PREFIX	= 4,	/* text started with a prefix */
-	LOG_CONT	= 8,	/* text is a fragment of a continuation line */
-};
-
-struct log {
-	u64 ts_nsec;		/* timestamp in nanoseconds */
-	u16 len;		/* length of entire record */
-	u16 text_len;		/* length of text buffer */
-	u16 dict_len;		/* length of dictionary buffer */
-	u8 facility;		/* syslog facility */
-	u8 flags:5;		/* internal record flags */
-	u8 level:3;		/* syslog level */
-};
-
-/*
- * The logbuf_lock protects kmsg buffer, indices, counters. It is also
- * used in interesting ways to provide interlocking in console_unlock();
- */
-static DEFINE_RAW_SPINLOCK(logbuf_lock);
-
-#ifdef CONFIG_PRINTK
-DECLARE_WAIT_QUEUE_HEAD(log_wait);
-/* the next printk record to read by syslog(READ) or /proc/kmsg */
-static u64 syslog_seq;
-static u32 syslog_idx;
-static enum log_flags syslog_prev;
-static size_t syslog_partial;
-
-/* index and sequence number of the first record stored in the buffer */
-static u64 log_first_seq;
-static u32 log_first_idx;
-
-/* index and sequence number of the next record to store in the buffer */
-static u64 log_next_seq;
-static u32 log_next_idx;
-
-/* the next printk record to write to the console */
-static u64 console_seq;
-static u32 console_idx;
-static enum log_flags console_prev;
-
-/* the next printk record to read after the last 'clear' command */
-static u64 clear_seq;
-static u32 clear_idx;
-
-#define PREFIX_MAX		32
-#define LOG_LINE_MAX		1024 - PREFIX_MAX
-
-/* record buffer */
-#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
-#define LOG_ALIGN 4
-#else
-#define LOG_ALIGN __alignof__(struct log)
-#endif
-#define __LOG_BUF_LEN (1 << CONFIG_LOG_BUF_SHIFT)
-static char __log_buf[__LOG_BUF_LEN] __aligned(LOG_ALIGN);
-static char *log_buf = __log_buf;
-static u32 log_buf_len = __LOG_BUF_LEN;
-
-/* cpu currently holding logbuf_lock */
-static volatile unsigned int logbuf_cpu = UINT_MAX;
-
-/* human readable text of the record */
-static char *log_text(const struct log *msg)
-{
-	return (char *)msg + sizeof(struct log);
-}
-
-/* optional key/value pair dictionary attached to the record */
-static char *log_dict(const struct log *msg)
-{
-	return (char *)msg + sizeof(struct log) + msg->text_len;
-}
-
-/* get record by index; idx must point to valid msg */
-static struct log *log_from_idx(u32 idx)
-{
-	struct log *msg = (struct log *)(log_buf + idx);
-
-	/*
-	 * A length == 0 record is the end of buffer marker. Wrap around and
-	 * read the message at the start of the buffer.
-	 */
-	if (!msg->len)
-		return (struct log *)log_buf;
-	return msg;
-}
-
-/* get next record; idx must point to valid msg */
-static u32 log_next(u32 idx)
-{
-	struct log *msg = (struct log *)(log_buf + idx);
-
-	/* length == 0 indicates the end of the buffer; wrap */
-	/*
-	 * A length == 0 record is the end of buffer marker. Wrap around and
-	 * read the message at the start of the buffer as *this* one, and
-	 * return the one after that.
-	 */
-	if (!msg->len) {
-		msg = (struct log *)log_buf;
-		return msg->len;
-	}
-	return idx + msg->len;
-}
-
-/* insert record into the buffer, discard old ones, update heads */
-static void log_store(int facility, int level,
-		      enum log_flags flags, u64 ts_nsec,
-		      const char *dict, u16 dict_len,
-		      const char *text, u16 text_len)
-{
-	struct log *msg;
-	u32 size, pad_len;
-
-	/* number of '\0' padding bytes to next message */
-	size = sizeof(struct log) + text_len + dict_len;
-	pad_len = (-size) & (LOG_ALIGN - 1);
-	size += pad_len;
-
-	while (log_first_seq < log_next_seq) {
-		u32 free;
-
-		if (log_next_idx > log_first_idx)
-			free = max(log_buf_len - log_next_idx, log_first_idx);
-		else
-			free = log_first_idx - log_next_idx;
-
-		if (free > size + sizeof(struct log))
-			break;
-
-		/* drop old messages until we have enough contiuous space */
-		log_first_idx = log_next(log_first_idx);
-		log_first_seq++;
-	}
-
-	if (log_next_idx + size + sizeof(struct log) >= log_buf_len) {
-		/*
-		 * This message + an additional empty header does not fit
-		 * at the end of the buffer. Add an empty header with len == 0
-		 * to signify a wrap around.
-		 */
-		memset(log_buf + log_next_idx, 0, sizeof(struct log));
-		log_next_idx = 0;
-	}
-
-	/* fill message */
-	msg = (struct log *)(log_buf + log_next_idx);
-	memcpy(log_text(msg), text, text_len);
-	msg->text_len = text_len;
-	memcpy(log_dict(msg), dict, dict_len);
-	msg->dict_len = dict_len;
-	msg->facility = facility;
-	msg->level = level & 7;
-	msg->flags = flags & 0x1f;
-	if (ts_nsec > 0)
-		msg->ts_nsec = ts_nsec;
-	else
-		msg->ts_nsec = local_clock();
-	memset(log_dict(msg) + dict_len, 0, pad_len);
-	msg->len = sizeof(struct log) + text_len + dict_len + pad_len;
-
-	/* insert message */
-	log_next_idx += msg->len;
-	log_next_seq++;
-}
-
-#ifdef CONFIG_SECURITY_DMESG_RESTRICT
-int dmesg_restrict = 1;
-#else
-int dmesg_restrict;
-#endif
-
-static int syslog_action_restricted(int type)
-{
-	if (dmesg_restrict)
-		return 1;
-	/*
-	 * Unless restricted, we allow "read all" and "get buffer size"
-	 * for everybody.
-	 */
-	return type != SYSLOG_ACTION_READ_ALL &&
-	       type != SYSLOG_ACTION_SIZE_BUFFER;
-}
-
-static int check_syslog_permissions(int type, bool from_file)
-{
-	/*
-	 * If this is from /proc/kmsg and we've already opened it, then we've
-	 * already done the capabilities checks at open time.
-	 */
-	if (from_file && type != SYSLOG_ACTION_OPEN)
-		return 0;
-
-	if (syslog_action_restricted(type)) {
-		if (capable(CAP_SYSLOG))
-			return 0;
-		/*
-		 * For historical reasons, accept CAP_SYS_ADMIN too, with
-		 * a warning.
-		 */
-		if (capable(CAP_SYS_ADMIN)) {
-			pr_warn_once("%s (%d): Attempt to access syslog with "
-				     "CAP_SYS_ADMIN but no CAP_SYSLOG "
-				     "(deprecated).\n",
-				 current->comm, task_pid_nr(current));
-			return 0;
-		}
-		return -EPERM;
-	}
-	return security_syslog(type);
-}
-
-
-/* /dev/kmsg - userspace message inject/listen interface */
-struct devkmsg_user {
-	u64 seq;
-	u32 idx;
-	enum log_flags prev;
-	struct mutex lock;
-	char buf[8192];
-};
-
-static ssize_t devkmsg_writev(struct kiocb *iocb, const struct iovec *iv,
-			      unsigned long count, loff_t pos)
-{
-	char *buf, *line;
-	int i;
-	int level = default_message_loglevel;
-	int facility = 1;	/* LOG_USER */
-	size_t len = iov_length(iv, count);
-	ssize_t ret = len;
-
-	if (len > LOG_LINE_MAX)
-		return -EINVAL;
-	buf = kmalloc(len+1, GFP_KERNEL);
-	if (buf == NULL)
-		return -ENOMEM;
-
-	line = buf;
-	for (i = 0; i < count; i++) {
-		if (copy_from_user(line, iv[i].iov_base, iv[i].iov_len)) {
-			ret = -EFAULT;
-			goto out;
-		}
-		line += iv[i].iov_len;
-	}
-
-	/*
-	 * Extract and skip the syslog prefix <[0-9]*>. Coming from userspace
-	 * the decimal value represents 32bit, the lower 3 bit are the log
-	 * level, the rest are the log facility.
-	 *
-	 * If no prefix or no userspace facility is specified, we
-	 * enforce LOG_USER, to be able to reliably distinguish
-	 * kernel-generated messages from userspace-injected ones.
-	 */
-	line = buf;
-	if (line[0] == '<') {
-		char *endp = NULL;
-
-		i = simple_strtoul(line+1, &endp, 10);
-		if (endp && endp[0] == '>') {
-			level = i & 7;
-			if (i >> 3)
-				facility = i >> 3;
-			endp++;
-			len -= endp - line;
-			line = endp;
-		}
-	}
-	line[len] = '\0';
-
-	printk_emit(facility, level, NULL, 0, "%s", line);
-out:
-	kfree(buf);
-	return ret;
-}
-
-static ssize_t devkmsg_read(struct file *file, char __user *buf,
-			    size_t count, loff_t *ppos)
-{
-	struct devkmsg_user *user = file->private_data;
-	struct log *msg;
-	u64 ts_usec;
-	size_t i;
-	char cont = '-';
-	size_t len;
-	ssize_t ret;
-
-	if (!user)
-		return -EBADF;
-
-	ret = mutex_lock_interruptible(&user->lock);
-	if (ret)
-		return ret;
-	raw_spin_lock_irq(&logbuf_lock);
-	while (user->seq == log_next_seq) {
-		if (file->f_flags & O_NONBLOCK) {
-			ret = -EAGAIN;
-			raw_spin_unlock_irq(&logbuf_lock);
-			goto out;
-		}
-
-		raw_spin_unlock_irq(&logbuf_lock);
-		ret = wait_event_interruptible(log_wait,
-					       user->seq != log_next_seq);
-		if (ret)
-			goto out;
-		raw_spin_lock_irq(&logbuf_lock);
-	}
-
-	if (user->seq < log_first_seq) {
-		/* our last seen message is gone, return error and reset */
-		user->idx = log_first_idx;
-		user->seq = log_first_seq;
-		ret = -EPIPE;
-		raw_spin_unlock_irq(&logbuf_lock);
-		goto out;
-	}
-
-	msg = log_from_idx(user->idx);
-	ts_usec = msg->ts_nsec;
-	do_div(ts_usec, 1000);
-
-	/*
-	 * If we couldn't merge continuation line fragments during the print,
-	 * export the stored flags to allow an optional external merge of the
-	 * records. Merging the records isn't always neccessarily correct, like
-	 * when we hit a race during printing. In most cases though, it produces
-	 * better readable output. 'c' in the record flags mark the first
-	 * fragment of a line, '+' the following.
-	 */
-	if (msg->flags & LOG_CONT && !(user->prev & LOG_CONT))
-		cont = 'c';
-	else if ((msg->flags & LOG_CONT) ||
-		 ((user->prev & LOG_CONT) && !(msg->flags & LOG_PREFIX)))
-		cont = '+';
-
-	len = sprintf(user->buf, "%u,%llu,%llu,%c;",
-		      (msg->facility << 3) | msg->level,
-		      user->seq, ts_usec, cont);
-	user->prev = msg->flags;
-
-	/* escape non-printable characters */
-	for (i = 0; i < msg->text_len; i++) {
-		unsigned char c = log_text(msg)[i];
-
-		if (c < ' ' || c >= 127 || c == '\\')
-			len += sprintf(user->buf + len, "\\x%02x", c);
-		else
-			user->buf[len++] = c;
-	}
-	user->buf[len++] = '\n';
-
-	if (msg->dict_len) {
-		bool line = true;
-
-		for (i = 0; i < msg->dict_len; i++) {
-			unsigned char c = log_dict(msg)[i];
-
-			if (line) {
-				user->buf[len++] = ' ';
-				line = false;
-			}
-
-			if (c == '\0') {
-				user->buf[len++] = '\n';
-				line = true;
-				continue;
-			}
-
-			if (c < ' ' || c >= 127 || c == '\\') {
-				len += sprintf(user->buf + len, "\\x%02x", c);
-				continue;
-			}
-
-			user->buf[len++] = c;
-		}
-		user->buf[len++] = '\n';
-	}
-
-	user->idx = log_next(user->idx);
-	user->seq++;
-	raw_spin_unlock_irq(&logbuf_lock);
-
-	if (len > count) {
-		ret = -EINVAL;
-		goto out;
-	}
-
-	if (copy_to_user(buf, user->buf, len)) {
-		ret = -EFAULT;
-		goto out;
-	}
-	ret = len;
-out:
-	mutex_unlock(&user->lock);
-	return ret;
-}
-
-static loff_t devkmsg_llseek(struct file *file, loff_t offset, int whence)
-{
-	struct devkmsg_user *user = file->private_data;
-	loff_t ret = 0;
-
-	if (!user)
-		return -EBADF;
-	if (offset)
-		return -ESPIPE;
-
-	raw_spin_lock_irq(&logbuf_lock);
-	switch (whence) {
-	case SEEK_SET:
-		/* the first record */
-		user->idx = log_first_idx;
-		user->seq = log_first_seq;
-		break;
-	case SEEK_DATA:
-		/*
-		 * The first record after the last SYSLOG_ACTION_CLEAR,
-		 * like issued by 'dmesg -c'. Reading /dev/kmsg itself
-		 * changes no global state, and does not clear anything.
-		 */
-		user->idx = clear_idx;
-		user->seq = clear_seq;
-		break;
-	case SEEK_END:
-		/* after the last record */
-		user->idx = log_next_idx;
-		user->seq = log_next_seq;
-		break;
-	default:
-		ret = -EINVAL;
-	}
-	raw_spin_unlock_irq(&logbuf_lock);
-	return ret;
-}
-
-static unsigned int devkmsg_poll(struct file *file, poll_table *wait)
-{
-	struct devkmsg_user *user = file->private_data;
-	int ret = 0;
-
-	if (!user)
-		return POLLERR|POLLNVAL;
-
-	poll_wait(file, &log_wait, wait);
-
-	raw_spin_lock_irq(&logbuf_lock);
-	if (user->seq < log_next_seq) {
-		/* return error when data has vanished underneath us */
-		if (user->seq < log_first_seq)
-			ret = POLLIN|POLLRDNORM|POLLERR|POLLPRI;
-		else
-			ret = POLLIN|POLLRDNORM;
-	}
-	raw_spin_unlock_irq(&logbuf_lock);
-
-	return ret;
-}
-
-static int devkmsg_open(struct inode *inode, struct file *file)
-{
-	struct devkmsg_user *user;
-	int err;
-
-	/* write-only does not need any file context */
-	if ((file->f_flags & O_ACCMODE) == O_WRONLY)
-		return 0;
-
-	err = check_syslog_permissions(SYSLOG_ACTION_READ_ALL,
-				       SYSLOG_FROM_READER);
-	if (err)
-		return err;
-
-	user = kmalloc(sizeof(struct devkmsg_user), GFP_KERNEL);
-	if (!user)
-		return -ENOMEM;
-
-	mutex_init(&user->lock);
-
-	raw_spin_lock_irq(&logbuf_lock);
-	user->idx = log_first_idx;
-	user->seq = log_first_seq;
-	raw_spin_unlock_irq(&logbuf_lock);
-
-	file->private_data = user;
-	return 0;
-}
-
-static int devkmsg_release(struct inode *inode, struct file *file)
-{
-	struct devkmsg_user *user = file->private_data;
-
-	if (!user)
-		return 0;
-
-	mutex_destroy(&user->lock);
-	kfree(user);
-	return 0;
-}
-
-const struct file_operations kmsg_fops = {
-	.open = devkmsg_open,
-	.read = devkmsg_read,
-	.aio_write = devkmsg_writev,
-	.llseek = devkmsg_llseek,
-	.poll = devkmsg_poll,
-	.release = devkmsg_release,
-};
-
-#ifdef CONFIG_KEXEC
-/*
- * This appends the listed symbols to /proc/vmcoreinfo
- *
- * /proc/vmcoreinfo is used by various utiilties, like crash and makedumpfile to
- * obtain access to symbols that are otherwise very difficult to locate.  These
- * symbols are specifically used so that utilities can access and extract the
- * dmesg log from a vmcore file after a crash.
- */
-void log_buf_kexec_setup(void)
-{
-	VMCOREINFO_SYMBOL(log_buf);
-	VMCOREINFO_SYMBOL(log_buf_len);
-	VMCOREINFO_SYMBOL(log_first_idx);
-	VMCOREINFO_SYMBOL(log_next_idx);
-	/*
-	 * Export struct log size and field offsets. User space tools can
-	 * parse it and detect any changes to structure down the line.
-	 */
-	VMCOREINFO_STRUCT_SIZE(log);
-	VMCOREINFO_OFFSET(log, ts_nsec);
-	VMCOREINFO_OFFSET(log, len);
-	VMCOREINFO_OFFSET(log, text_len);
-	VMCOREINFO_OFFSET(log, dict_len);
-}
-#endif
-
-/* requested log_buf_len from kernel cmdline */
-static unsigned long __initdata new_log_buf_len;
-
-/* save requested log_buf_len since it's too early to process it */
-static int __init log_buf_len_setup(char *str)
-{
-	unsigned size = memparse(str, &str);
-
-	if (size)
-		size = roundup_pow_of_two(size);
-	if (size > log_buf_len)
-		new_log_buf_len = size;
-
-	return 0;
-}
-early_param("log_buf_len", log_buf_len_setup);
-
-void __init setup_log_buf(int early)
-{
-	unsigned long flags;
-	char *new_log_buf;
-	int free;
-
-	if (!new_log_buf_len)
-		return;
-
-	if (early) {
-		unsigned long mem;
-
-		mem = memblock_alloc(new_log_buf_len, PAGE_SIZE);
-		if (!mem)
-			return;
-		new_log_buf = __va(mem);
-	} else {
-		new_log_buf = alloc_bootmem_nopanic(new_log_buf_len);
-	}
-
-	if (unlikely(!new_log_buf)) {
-		pr_err("log_buf_len: %ld bytes not available\n",
-			new_log_buf_len);
-		return;
-	}
-
-	raw_spin_lock_irqsave(&logbuf_lock, flags);
-	log_buf_len = new_log_buf_len;
-	log_buf = new_log_buf;
-	new_log_buf_len = 0;
-	free = __LOG_BUF_LEN - log_next_idx;
-	memcpy(log_buf, __log_buf, __LOG_BUF_LEN);
-	raw_spin_unlock_irqrestore(&logbuf_lock, flags);
-
-	pr_info("log_buf_len: %d\n", log_buf_len);
-	pr_info("early log buf free: %d(%d%%)\n",
-		free, (free * 100) / __LOG_BUF_LEN);
-}
-
-static bool __read_mostly ignore_loglevel;
-
-static int __init ignore_loglevel_setup(char *str)
-{
-	ignore_loglevel = 1;
-	printk(KERN_INFO "debug: ignoring loglevel setting.\n");
-
-	return 0;
-}
-
-early_param("ignore_loglevel", ignore_loglevel_setup);
-module_param(ignore_loglevel, bool, S_IRUGO | S_IWUSR);
-MODULE_PARM_DESC(ignore_loglevel, "ignore loglevel setting, to"
-	"print all kernel messages to the console.");
-
-#ifdef CONFIG_BOOT_PRINTK_DELAY
-
-static int boot_delay; /* msecs delay after each printk during bootup */
-static unsigned long long loops_per_msec;	/* based on boot_delay */
-
-static int __init boot_delay_setup(char *str)
-{
-	unsigned long lpj;
-
-	lpj = preset_lpj ? preset_lpj : 1000000;	/* some guess */
-	loops_per_msec = (unsigned long long)lpj / 1000 * HZ;
-
-	get_option(&str, &boot_delay);
-	if (boot_delay > 10 * 1000)
-		boot_delay = 0;
-
-	pr_debug("boot_delay: %u, preset_lpj: %ld, lpj: %lu, "
-		"HZ: %d, loops_per_msec: %llu\n",
-		boot_delay, preset_lpj, lpj, HZ, loops_per_msec);
-	return 1;
-}
-__setup("boot_delay=", boot_delay_setup);
-
-static void boot_delay_msec(int level)
-{
-	unsigned long long k;
-	unsigned long timeout;
-
-	if ((boot_delay == 0 || system_state != SYSTEM_BOOTING)
-		|| (level >= console_loglevel && !ignore_loglevel)) {
-		return;
-	}
-
-	k = (unsigned long long)loops_per_msec * boot_delay;
-
-	timeout = jiffies + msecs_to_jiffies(boot_delay);
-	while (k) {
-		k--;
-		cpu_relax();
-		/*
-		 * use (volatile) jiffies to prevent
-		 * compiler reduction; loop termination via jiffies
-		 * is secondary and may or may not happen.
-		 */
-		if (time_after(jiffies, timeout))
-			break;
-		touch_nmi_watchdog();
-	}
-}
-#else
-static inline void boot_delay_msec(int level)
-{
-}
-#endif
-
-#if defined(CONFIG_PRINTK_TIME)
-static bool printk_time = 1;
-#else
-static bool printk_time;
-#endif
-module_param_named(time, printk_time, bool, S_IRUGO | S_IWUSR);
-
-static size_t print_time(u64 ts, char *buf)
-{
-	unsigned long rem_nsec;
-
-	if (!printk_time)
-		return 0;
-
-	rem_nsec = do_div(ts, 1000000000);
-
-	if (!buf)
-		return snprintf(NULL, 0, "[%5lu.000000] ", (unsigned long)ts);
-
-	return sprintf(buf, "[%5lu.%06lu] ",
-		       (unsigned long)ts, rem_nsec / 1000);
-}
-
-static size_t print_prefix(const struct log *msg, bool syslog, char *buf)
-{
-	size_t len = 0;
-	unsigned int prefix = (msg->facility << 3) | msg->level;
-
-	if (syslog) {
-		if (buf) {
-			len += sprintf(buf, "<%u>", prefix);
-		} else {
-			len += 3;
-			if (prefix > 999)
-				len += 3;
-			else if (prefix > 99)
-				len += 2;
-			else if (prefix > 9)
-				len++;
-		}
-	}
-
-	len += print_time(msg->ts_nsec, buf ? buf + len : NULL);
-	return len;
-}
-
-static size_t msg_print_text(const struct log *msg, enum log_flags prev,
-			     bool syslog, char *buf, size_t size)
-{
-	const char *text = log_text(msg);
-	size_t text_size = msg->text_len;
-	bool prefix = true;
-	bool newline = true;
-	size_t len = 0;
-
-	if ((prev & LOG_CONT) && !(msg->flags & LOG_PREFIX))
-		prefix = false;
-
-	if (msg->flags & LOG_CONT) {
-		if ((prev & LOG_CONT) && !(prev & LOG_NEWLINE))
-			prefix = false;
-
-		if (!(msg->flags & LOG_NEWLINE))
-			newline = false;
-	}
-
-	do {
-		const char *next = memchr(text, '\n', text_size);
-		size_t text_len;
-
-		if (next) {
-			text_len = next - text;
-			next++;
-			text_size -= next - text;
-		} else {
-			text_len = text_size;
-		}
-
-		if (buf) {
-			if (print_prefix(msg, syslog, NULL) +
-			    text_len + 1 >= size - len)
-				break;
-
-			if (prefix)
-				len += print_prefix(msg, syslog, buf + len);
-			memcpy(buf + len, text, text_len);
-			len += text_len;
-			if (next || newline)
-				buf[len++] = '\n';
-		} else {
-			/* SYSLOG_ACTION_* buffer size only calculation */
-			if (prefix)
-				len += print_prefix(msg, syslog, NULL);
-			len += text_len;
-			if (next || newline)
-				len++;
-		}
-
-		prefix = true;
-		text = next;
-	} while (text);
-
-	return len;
-}
-
-static int syslog_print(char __user *buf, int size)
-{
-	char *text;
-	struct log *msg;
-	int len = 0;
-
-	text = kmalloc(LOG_LINE_MAX + PREFIX_MAX, GFP_KERNEL);
-	if (!text)
-		return -ENOMEM;
-
-	while (size > 0) {
-		size_t n;
-		size_t skip;
-
-		raw_spin_lock_irq(&logbuf_lock);
-		if (syslog_seq < log_first_seq) {
-			/* messages are gone, move to first one */
-			syslog_seq = log_first_seq;
-			syslog_idx = log_first_idx;
-			syslog_prev = 0;
-			syslog_partial = 0;
-		}
-		if (syslog_seq == log_next_seq) {
-			raw_spin_unlock_irq(&logbuf_lock);
-			break;
-		}
-
-		skip = syslog_partial;
-		msg = log_from_idx(syslog_idx);
-		n = msg_print_text(msg, syslog_prev, true, text,
-				   LOG_LINE_MAX + PREFIX_MAX);
-		if (n - syslog_partial <= size) {
-			/* message fits into buffer, move forward */
-			syslog_idx = log_next(syslog_idx);
-			syslog_seq++;
-			syslog_prev = msg->flags;
-			n -= syslog_partial;
-			syslog_partial = 0;
-		} else if (!len){
-			/* partial read(), remember position */
-			n = size;
-			syslog_partial += n;
-		} else
-			n = 0;
-		raw_spin_unlock_irq(&logbuf_lock);
-
-		if (!n)
-			break;
-
-		if (copy_to_user(buf, text + skip, n)) {
-			if (!len)
-				len = -EFAULT;
-			break;
-		}
-
-		len += n;
-		size -= n;
-		buf += n;
-	}
-
-	kfree(text);
-	return len;
-}
-
-static int syslog_print_all(char __user *buf, int size, bool clear)
-{
-	char *text;
-	int len = 0;
-
-	text = kmalloc(LOG_LINE_MAX + PREFIX_MAX, GFP_KERNEL);
-	if (!text)
-		return -ENOMEM;
-
-	raw_spin_lock_irq(&logbuf_lock);
-	if (buf) {
-		u64 next_seq;
-		u64 seq;
-		u32 idx;
-		enum log_flags prev;
-
-		if (clear_seq < log_first_seq) {
-			/* messages are gone, move to first available one */
-			clear_seq = log_first_seq;
-			clear_idx = log_first_idx;
-		}
-
-		/*
-		 * Find first record that fits, including all following records,
-		 * into the user-provided buffer for this dump.
-		 */
-		seq = clear_seq;
-		idx = clear_idx;
-		prev = 0;
-		while (seq < log_next_seq) {
-			struct log *msg = log_from_idx(idx);
-
-			len += msg_print_text(msg, prev, true, NULL, 0);
-			prev = msg->flags;
-			idx = log_next(idx);
-			seq++;
-		}
-
-		/* move first record forward until length fits into the buffer */
-		seq = clear_seq;
-		idx = clear_idx;
-		prev = 0;
-		while (len > size && seq < log_next_seq) {
-			struct log *msg = log_from_idx(idx);
-
-			len -= msg_print_text(msg, prev, true, NULL, 0);
-			prev = msg->flags;
-			idx = log_next(idx);
-			seq++;
-		}
-
-		/* last message fitting into this dump */
-		next_seq = log_next_seq;
-
-		len = 0;
-		prev = 0;
-		while (len >= 0 && seq < next_seq) {
-			struct log *msg = log_from_idx(idx);
-			int textlen;
-
-			textlen = msg_print_text(msg, prev, true, text,
-						 LOG_LINE_MAX + PREFIX_MAX);
-			if (textlen < 0) {
-				len = textlen;
-				break;
-			}
-			idx = log_next(idx);
-			seq++;
-			prev = msg->flags;
-
-			raw_spin_unlock_irq(&logbuf_lock);
-			if (copy_to_user(buf + len, text, textlen))
-				len = -EFAULT;
-			else
-				len += textlen;
-			raw_spin_lock_irq(&logbuf_lock);
-
-			if (seq < log_first_seq) {
-				/* messages are gone, move to next one */
-				seq = log_first_seq;
-				idx = log_first_idx;
-				prev = 0;
-			}
-		}
-	}
-
-	if (clear) {
-		clear_seq = log_next_seq;
-		clear_idx = log_next_idx;
-	}
-	raw_spin_unlock_irq(&logbuf_lock);
-
-	kfree(text);
-	return len;
-}
-
-int do_syslog(int type, char __user *buf, int len, bool from_file)
-{
-	bool clear = false;
-	static int saved_console_loglevel = -1;
-	int error;
-
-	error = check_syslog_permissions(type, from_file);
-	if (error)
-		goto out;
-
-	error = security_syslog(type);
-	if (error)
-		return error;
-
-	switch (type) {
-	case SYSLOG_ACTION_CLOSE:	/* Close log */
-		break;
-	case SYSLOG_ACTION_OPEN:	/* Open log */
-		break;
-	case SYSLOG_ACTION_READ:	/* Read from log */
-		error = -EINVAL;
-		if (!buf || len < 0)
-			goto out;
-		error = 0;
-		if (!len)
-			goto out;
-		if (!access_ok(VERIFY_WRITE, buf, len)) {
-			error = -EFAULT;
-			goto out;
-		}
-		error = wait_event_interruptible(log_wait,
-						 syslog_seq != log_next_seq);
-		if (error)
-			goto out;
-		error = syslog_print(buf, len);
-		break;
-	/* Read/clear last kernel messages */
-	case SYSLOG_ACTION_READ_CLEAR:
-		clear = true;
-		/* FALL THRU */
-	/* Read last kernel messages */
-	case SYSLOG_ACTION_READ_ALL:
-		error = -EINVAL;
-		if (!buf || len < 0)
-			goto out;
-		error = 0;
-		if (!len)
-			goto out;
-		if (!access_ok(VERIFY_WRITE, buf, len)) {
-			error = -EFAULT;
-			goto out;
-		}
-		error = syslog_print_all(buf, len, clear);
-		break;
-	/* Clear ring buffer */
-	case SYSLOG_ACTION_CLEAR:
-		syslog_print_all(NULL, 0, true);
-		break;
-	/* Disable logging to console */
-	case SYSLOG_ACTION_CONSOLE_OFF:
-		if (saved_console_loglevel == -1)
-			saved_console_loglevel = console_loglevel;
-		console_loglevel = minimum_console_loglevel;
-		break;
-	/* Enable logging to console */
-	case SYSLOG_ACTION_CONSOLE_ON:
-		if (saved_console_loglevel != -1) {
-			console_loglevel = saved_console_loglevel;
-			saved_console_loglevel = -1;
-		}
-		break;
-	/* Set level of messages printed to console */
-	case SYSLOG_ACTION_CONSOLE_LEVEL:
-		error = -EINVAL;
-		if (len < 1 || len > 8)
-			goto out;
-		if (len < minimum_console_loglevel)
-			len = minimum_console_loglevel;
-		console_loglevel = len;
-		/* Implicitly re-enable logging to console */
-		saved_console_loglevel = -1;
-		error = 0;
-		break;
-	/* Number of chars in the log buffer */
-	case SYSLOG_ACTION_SIZE_UNREAD:
-		raw_spin_lock_irq(&logbuf_lock);
-		if (syslog_seq < log_first_seq) {
-			/* messages are gone, move to first one */
-			syslog_seq = log_first_seq;
-			syslog_idx = log_first_idx;
-			syslog_prev = 0;
-			syslog_partial = 0;
-		}
-		if (from_file) {
-			/*
-			 * Short-cut for poll(/"proc/kmsg") which simply checks
-			 * for pending data, not the size; return the count of
-			 * records, not the length.
-			 */
-			error = log_next_idx - syslog_idx;
-		} else {
-			u64 seq = syslog_seq;
-			u32 idx = syslog_idx;
-			enum log_flags prev = syslog_prev;
-
-			error = 0;
-			while (seq < log_next_seq) {
-				struct log *msg = log_from_idx(idx);
-
-				error += msg_print_text(msg, prev, true, NULL, 0);
-				idx = log_next(idx);
-				seq++;
-				prev = msg->flags;
-			}
-			error -= syslog_partial;
-		}
-		raw_spin_unlock_irq(&logbuf_lock);
-		break;
-	/* Size of the log buffer */
-	case SYSLOG_ACTION_SIZE_BUFFER:
-		error = log_buf_len;
-		break;
-	default:
-		error = -EINVAL;
-		break;
-	}
-out:
-	return error;
-}
-
-SYSCALL_DEFINE3(syslog, int, type, char __user *, buf, int, len)
-{
-	return do_syslog(type, buf, len, SYSLOG_FROM_READER);
-}
-
-/*
- * Call the console drivers, asking them to write out
- * log_buf[start] to log_buf[end - 1].
- * The console_lock must be held.
- */
-static void call_console_drivers(int level, const char *text, size_t len)
-{
-	struct console *con;
-
-	trace_console(text, len);
-
-	if (level >= console_loglevel && !ignore_loglevel)
-		return;
-	if (!console_drivers)
-		return;
-
-	for_each_console(con) {
-		if (exclusive_console && con != exclusive_console)
-			continue;
-		if (!(con->flags & CON_ENABLED))
-			continue;
-		if (!con->write)
-			continue;
-		if (!cpu_online(smp_processor_id()) &&
-		    !(con->flags & CON_ANYTIME))
-			continue;
-		con->write(con, text, len);
-	}
-}
-
-/*
- * Zap console related locks when oopsing. Only zap at most once
- * every 10 seconds, to leave time for slow consoles to print a
- * full oops.
- */
-static void zap_locks(void)
-{
-	static unsigned long oops_timestamp;
-
-	if (time_after_eq(jiffies, oops_timestamp) &&
-			!time_after(jiffies, oops_timestamp + 30 * HZ))
-		return;
-
-	oops_timestamp = jiffies;
-
-	debug_locks_off();
-	/* If a crash is occurring, make sure we can't deadlock */
-	raw_spin_lock_init(&logbuf_lock);
-	/* And make sure that we print immediately */
-	sema_init(&console_sem, 1);
-}
-
-/* Check if we have any console registered that can be called early in boot. */
-static int have_callable_console(void)
-{
-	struct console *con;
-
-	for_each_console(con)
-		if (con->flags & CON_ANYTIME)
-			return 1;
-
-	return 0;
-}
-
-/*
- * Can we actually use the console at this time on this cpu?
- *
- * Console drivers may assume that per-cpu resources have
- * been allocated. So unless they're explicitly marked as
- * being able to cope (CON_ANYTIME) don't call them until
- * this CPU is officially up.
- */
-static inline int can_use_console(unsigned int cpu)
-{
-	return cpu_online(cpu) || have_callable_console();
-}
-
-/*
- * Try to get console ownership to actually show the kernel
- * messages from a 'printk'. Return true (and with the
- * console_lock held, and 'console_locked' set) if it
- * is successful, false otherwise.
- *
- * This gets called with the 'logbuf_lock' spinlock held and
- * interrupts disabled. It should return with 'lockbuf_lock'
- * released but interrupts still disabled.
- */
-static int console_trylock_for_printk(unsigned int cpu)
-	__releases(&logbuf_lock)
-{
-	int retval = 0, wake = 0;
-
-	if (console_trylock()) {
-		retval = 1;
-
-		/*
-		 * If we can't use the console, we need to release
-		 * the console semaphore by hand to avoid flushing
-		 * the buffer. We need to hold the console semaphore
-		 * in order to do this test safely.
-		 */
-		if (!can_use_console(cpu)) {
-			console_locked = 0;
-			wake = 1;
-			retval = 0;
-		}
-	}
-	logbuf_cpu = UINT_MAX;
-	raw_spin_unlock(&logbuf_lock);
-	if (wake)
-		up(&console_sem);
-	return retval;
-}
-
-int printk_delay_msec __read_mostly;
-
-static inline void printk_delay(void)
-{
-	if (unlikely(printk_delay_msec)) {
-		int m = printk_delay_msec;
-
-		while (m--) {
-			mdelay(1);
-			touch_nmi_watchdog();
-		}
-	}
-}
-
-/*
- * Continuation lines are buffered, and not committed to the record buffer
- * until the line is complete, or a race forces it. The line fragments
- * though, are printed immediately to the consoles to ensure everything has
- * reached the console in case of a kernel crash.
- */
-static struct cont {
-	char buf[LOG_LINE_MAX];
-	size_t len;			/* length == 0 means unused buffer */
-	size_t cons;			/* bytes written to console */
-	struct task_struct *owner;	/* task of first print*/
-	u64 ts_nsec;			/* time of first print */
-	u8 level;			/* log level of first message */
-	u8 facility;			/* log level of first message */
-	enum log_flags flags;		/* prefix, newline flags */
-	bool flushed:1;			/* buffer sealed and committed */
-} cont;
-
-static void cont_flush(enum log_flags flags)
-{
-	if (cont.flushed)
-		return;
-	if (cont.len == 0)
-		return;
-
-	if (cont.cons) {
-		/*
-		 * If a fragment of this line was directly flushed to the
-		 * console; wait for the console to pick up the rest of the
-		 * line. LOG_NOCONS suppresses a duplicated output.
-		 */
-		log_store(cont.facility, cont.level, flags | LOG_NOCONS,
-			  cont.ts_nsec, NULL, 0, cont.buf, cont.len);
-		cont.flags = flags;
-		cont.flushed = true;
-	} else {
-		/*
-		 * If no fragment of this line ever reached the console,
-		 * just submit it to the store and free the buffer.
-		 */
-		log_store(cont.facility, cont.level, flags, 0,
-			  NULL, 0, cont.buf, cont.len);
-		cont.len = 0;
-	}
-}
-
-static bool cont_add(int facility, int level, const char *text, size_t len)
-{
-	if (cont.len && cont.flushed)
-		return false;
-
-	if (cont.len + len > sizeof(cont.buf)) {
-		/* the line gets too long, split it up in separate records */
-		cont_flush(LOG_CONT);
-		return false;
-	}
-
-	if (!cont.len) {
-		cont.facility = facility;
-		cont.level = level;
-		cont.owner = current;
-		cont.ts_nsec = local_clock();
-		cont.flags = 0;
-		cont.cons = 0;
-		cont.flushed = false;
-	}
-
-	memcpy(cont.buf + cont.len, text, len);
-	cont.len += len;
-
-	if (cont.len > (sizeof(cont.buf) * 80) / 100)
-		cont_flush(LOG_CONT);
-
-	return true;
-}
-
-static size_t cont_print_text(char *text, size_t size)
-{
-	size_t textlen = 0;
-	size_t len;
-
-	if (cont.cons == 0 && (console_prev & LOG_NEWLINE)) {
-		textlen += print_time(cont.ts_nsec, text);
-		size -= textlen;
-	}
-
-	len = cont.len - cont.cons;
-	if (len > 0) {
-		if (len+1 > size)
-			len = size-1;
-		memcpy(text + textlen, cont.buf + cont.cons, len);
-		textlen += len;
-		cont.cons = cont.len;
-	}
-
-	if (cont.flushed) {
-		if (cont.flags & LOG_NEWLINE)
-			text[textlen++] = '\n';
-		/* got everything, release buffer */
-		cont.len = 0;
-	}
-	return textlen;
-}
-
-asmlinkage int vprintk_emit(int facility, int level,
-			    const char *dict, size_t dictlen,
-			    const char *fmt, va_list args)
-{
-	static int recursion_bug;
-	static char textbuf[LOG_LINE_MAX];
-	char *text = textbuf;
-	size_t text_len;
-	enum log_flags lflags = 0;
-	unsigned long flags;
-	int this_cpu;
-	int printed_len = 0;
-
-	boot_delay_msec(level);
-	printk_delay();
-
-	/* This stops the holder of console_sem just where we want him */
-	local_irq_save(flags);
-	this_cpu = smp_processor_id();
-
-	/*
-	 * Ouch, printk recursed into itself!
-	 */
-	if (unlikely(logbuf_cpu == this_cpu)) {
-		/*
-		 * If a crash is occurring during printk() on this CPU,
-		 * then try to get the crash message out but make sure
-		 * we can't deadlock. Otherwise just return to avoid the
-		 * recursion and return - but flag the recursion so that
-		 * it can be printed at the next appropriate moment:
-		 */
-		if (!oops_in_progress && !lockdep_recursing(current)) {
-			recursion_bug = 1;
-			goto out_restore_irqs;
-		}
-		zap_locks();
-	}
-
-	lockdep_off();
-	raw_spin_lock(&logbuf_lock);
-	logbuf_cpu = this_cpu;
-
-	if (recursion_bug) {
-		static const char recursion_msg[] =
-			"BUG: recent printk recursion!";
-
-		recursion_bug = 0;
-		printed_len += strlen(recursion_msg);
-		/* emit KERN_CRIT message */
-		log_store(0, 2, LOG_PREFIX|LOG_NEWLINE, 0,
-			  NULL, 0, recursion_msg, printed_len);
-	}
-
-	/*
-	 * The printf needs to come first; we need the syslog
-	 * prefix which might be passed-in as a parameter.
-	 */
-	text_len = vscnprintf(text, sizeof(textbuf), fmt, args);
-
-	/* mark and strip a trailing newline */
-	if (text_len && text[text_len-1] == '\n') {
-		text_len--;
-		lflags |= LOG_NEWLINE;
-	}
-
-	/* strip kernel syslog prefix and extract log level or control flags */
-	if (facility == 0) {
-		int kern_level = printk_get_level(text);
-
-		if (kern_level) {
-			const char *end_of_header = printk_skip_level(text);
-			switch (kern_level) {
-			case '0' ... '7':
-				if (level == -1)
-					level = kern_level - '0';
-			case 'd':	/* KERN_DEFAULT */
-				lflags |= LOG_PREFIX;
-			case 'c':	/* KERN_CONT */
-				break;
-			}
-			text_len -= end_of_header - text;
-			text = (char *)end_of_header;
-		}
-	}
-
-	if (level == -1)
-		level = default_message_loglevel;
-
-	if (dict)
-		lflags |= LOG_PREFIX|LOG_NEWLINE;
-
-	if (!(lflags & LOG_NEWLINE)) {
-		/*
-		 * Flush the conflicting buffer. An earlier newline was missing,
-		 * or another task also prints continuation lines.
-		 */
-		if (cont.len && (lflags & LOG_PREFIX || cont.owner != current))
-			cont_flush(LOG_NEWLINE);
-
-		/* buffer line if possible, otherwise store it right away */
-		if (!cont_add(facility, level, text, text_len))
-			log_store(facility, level, lflags | LOG_CONT, 0,
-				  dict, dictlen, text, text_len);
-	} else {
-		bool stored = false;
-
-		/*
-		 * If an earlier newline was missing and it was the same task,
-		 * either merge it with the current buffer and flush, or if
-		 * there was a race with interrupts (prefix == true) then just
-		 * flush it out and store this line separately.
-		 */
-		if (cont.len && cont.owner == current) {
-			if (!(lflags & LOG_PREFIX))
-				stored = cont_add(facility, level, text, text_len);
-			cont_flush(LOG_NEWLINE);
-		}
-
-		if (!stored)
-			log_store(facility, level, lflags, 0,
-				  dict, dictlen, text, text_len);
-	}
-	printed_len += text_len;
-
-	/*
-	 * Try to acquire and then immediately release the console semaphore.
-	 * The release will print out buffers and wake up /dev/kmsg and syslog()
-	 * users.
-	 *
-	 * The console_trylock_for_printk() function will release 'logbuf_lock'
-	 * regardless of whether it actually gets the console semaphore or not.
-	 */
-	if (console_trylock_for_printk(this_cpu))
-		console_unlock();
-
-	lockdep_on();
-out_restore_irqs:
-	local_irq_restore(flags);
-
-	return printed_len;
-}
-EXPORT_SYMBOL(vprintk_emit);
-
-asmlinkage int vprintk(const char *fmt, va_list args)
-{
-	return vprintk_emit(0, -1, NULL, 0, fmt, args);
-}
-EXPORT_SYMBOL(vprintk);
-
-asmlinkage int printk_emit(int facility, int level,
-			   const char *dict, size_t dictlen,
-			   const char *fmt, ...)
-{
-	va_list args;
-	int r;
-
-	va_start(args, fmt);
-	r = vprintk_emit(facility, level, dict, dictlen, fmt, args);
-	va_end(args);
-
-	return r;
-}
-EXPORT_SYMBOL(printk_emit);
-
-/**
- * printk - print a kernel message
- * @fmt: format string
- *
- * This is printk(). It can be called from any context. We want it to work.
- *
- * We try to grab the console_lock. If we succeed, it's easy - we log the
- * output and call the console drivers.  If we fail to get the semaphore, we
- * place the output into the log buffer and return. The current holder of
- * the console_sem will notice the new output in console_unlock(); and will
- * send it to the consoles before releasing the lock.
- *
- * One effect of this deferred printing is that code which calls printk() and
- * then changes console_loglevel may break. This is because console_loglevel
- * is inspected when the actual printing occurs.
- *
- * See also:
- * printf(3)
- *
- * See the vsnprintf() documentation for format string extensions over C99.
- */
-asmlinkage int printk(const char *fmt, ...)
-{
-	va_list args;
-	int r;
-
-#ifdef CONFIG_KGDB_KDB
-	if (unlikely(kdb_trap_printk)) {
-		va_start(args, fmt);
-		r = vkdb_printf(fmt, args);
-		va_end(args);
-		return r;
-	}
-#endif
-	va_start(args, fmt);
-	r = vprintk_emit(0, -1, NULL, 0, fmt, args);
-	va_end(args);
-
-	return r;
-}
-EXPORT_SYMBOL(printk);
-
-#else /* CONFIG_PRINTK */
-
-#define LOG_LINE_MAX		0
-#define PREFIX_MAX		0
-#define LOG_LINE_MAX 0
-static u64 syslog_seq;
-static u32 syslog_idx;
-static u64 console_seq;
-static u32 console_idx;
-static enum log_flags syslog_prev;
-static u64 log_first_seq;
-static u32 log_first_idx;
-static u64 log_next_seq;
-static enum log_flags console_prev;
-static struct cont {
-	size_t len;
-	size_t cons;
-	u8 level;
-	bool flushed:1;
-} cont;
-static struct log *log_from_idx(u32 idx) { return NULL; }
-static u32 log_next(u32 idx) { return 0; }
-static void call_console_drivers(int level, const char *text, size_t len) {}
-static size_t msg_print_text(const struct log *msg, enum log_flags prev,
-			     bool syslog, char *buf, size_t size) { return 0; }
-static size_t cont_print_text(char *text, size_t size) { return 0; }
-
-#endif /* CONFIG_PRINTK */
-
-#ifdef CONFIG_EARLY_PRINTK
-struct console *early_console;
-
-void early_vprintk(const char *fmt, va_list ap)
-{
-	if (early_console) {
-		char buf[512];
-		int n = vscnprintf(buf, sizeof(buf), fmt, ap);
-
-		early_console->write(early_console, buf, n);
-	}
-}
-
-asmlinkage void early_printk(const char *fmt, ...)
-{
-	va_list ap;
-
-	va_start(ap, fmt);
-	early_vprintk(fmt, ap);
-	va_end(ap);
-}
-#endif
-
-static int __add_preferred_console(char *name, int idx, char *options,
-				   char *brl_options)
-{
-	struct console_cmdline *c;
-	int i;
-
-	/*
-	 *	See if this tty is not yet registered, and
-	 *	if we have a slot free.
-	 */
-	for (i = 0; i < MAX_CMDLINECONSOLES && console_cmdline[i].name[0]; i++)
-		if (strcmp(console_cmdline[i].name, name) == 0 &&
-			  console_cmdline[i].index == idx) {
-				if (!brl_options)
-					selected_console = i;
-				return 0;
-		}
-	if (i == MAX_CMDLINECONSOLES)
-		return -E2BIG;
-	if (!brl_options)
-		selected_console = i;
-	c = &console_cmdline[i];
-	strlcpy(c->name, name, sizeof(c->name));
-	c->options = options;
-#ifdef CONFIG_A11Y_BRAILLE_CONSOLE
-	c->brl_options = brl_options;
-#endif
-	c->index = idx;
-	return 0;
-}
-/*
- * Set up a list of consoles.  Called from init/main.c
- */
-static int __init console_setup(char *str)
-{
-	char buf[sizeof(console_cmdline[0].name) + 4]; /* 4 for index */
-	char *s, *options, *brl_options = NULL;
-	int idx;
-
-#ifdef CONFIG_A11Y_BRAILLE_CONSOLE
-	if (!memcmp(str, "brl,", 4)) {
-		brl_options = "";
-		str += 4;
-	} else if (!memcmp(str, "brl=", 4)) {
-		brl_options = str + 4;
-		str = strchr(brl_options, ',');
-		if (!str) {
-			printk(KERN_ERR "need port name after brl=\n");
-			return 1;
-		}
-		*(str++) = 0;
-	}
-#endif
-
-	/*
-	 * Decode str into name, index, options.
-	 */
-	if (str[0] >= '0' && str[0] <= '9') {
-		strcpy(buf, "ttyS");
-		strncpy(buf + 4, str, sizeof(buf) - 5);
-	} else {
-		strncpy(buf, str, sizeof(buf) - 1);
-	}
-	buf[sizeof(buf) - 1] = 0;
-	if ((options = strchr(str, ',')) != NULL)
-		*(options++) = 0;
-#ifdef __sparc__
-	if (!strcmp(str, "ttya"))
-		strcpy(buf, "ttyS0");
-	if (!strcmp(str, "ttyb"))
-		strcpy(buf, "ttyS1");
-#endif
-	for (s = buf; *s; s++)
-		if ((*s >= '0' && *s <= '9') || *s == ',')
-			break;
-	idx = simple_strtoul(s, NULL, 10);
-	*s = 0;
-
-	__add_preferred_console(buf, idx, options, brl_options);
-	console_set_on_cmdline = 1;
-	return 1;
-}
-__setup("console=", console_setup);
-
-/**
- * add_preferred_console - add a device to the list of preferred consoles.
- * @name: device name
- * @idx: device index
- * @options: options for this console
- *
- * The last preferred console added will be used for kernel messages
- * and stdin/out/err for init.  Normally this is used by console_setup
- * above to handle user-supplied console arguments; however it can also
- * be used by arch-specific code either to override the user or more
- * commonly to provide a default console (ie from PROM variables) when
- * the user has not supplied one.
- */
-int add_preferred_console(char *name, int idx, char *options)
-{
-	return __add_preferred_console(name, idx, options, NULL);
-}
-
-int update_console_cmdline(char *name, int idx, char *name_new, int idx_new, char *options)
-{
-	struct console_cmdline *c;
-	int i;
-
-	for (i = 0; i < MAX_CMDLINECONSOLES && console_cmdline[i].name[0]; i++)
-		if (strcmp(console_cmdline[i].name, name) == 0 &&
-			  console_cmdline[i].index == idx) {
-				c = &console_cmdline[i];
-				strlcpy(c->name, name_new, sizeof(c->name));
-				c->name[sizeof(c->name) - 1] = 0;
-				c->options = options;
-				c->index = idx_new;
-				return i;
-		}
-	/* not found */
-	return -1;
-}
-
-bool console_suspend_enabled = 1;
-EXPORT_SYMBOL(console_suspend_enabled);
-
-static int __init console_suspend_disable(char *str)
-{
-	console_suspend_enabled = 0;
-	return 1;
-}
-__setup("no_console_suspend", console_suspend_disable);
-module_param_named(console_suspend, console_suspend_enabled,
-		bool, S_IRUGO | S_IWUSR);
-MODULE_PARM_DESC(console_suspend, "suspend console during suspend"
-	" and hibernate operations");
-
-/**
- * suspend_console - suspend the console subsystem
- *
- * This disables printk() while we go into suspend states
- */
-void suspend_console(void)
-{
-	if (!console_suspend_enabled)
-		return;
-	printk("Suspending console(s) (use no_console_suspend to debug)\n");
-	console_lock();
-	console_suspended = 1;
-	up(&console_sem);
-}
-
-void resume_console(void)
-{
-	if (!console_suspend_enabled)
-		return;
-	down(&console_sem);
-	console_suspended = 0;
-	console_unlock();
-}
-
-/**
- * console_cpu_notify - print deferred console messages after CPU hotplug
- * @self: notifier struct
- * @action: CPU hotplug event
- * @hcpu: unused
- *
- * If printk() is called from a CPU that is not online yet, the messages
- * will be spooled but will not show up on the console.  This function is
- * called when a new CPU comes online (or fails to come up), and ensures
- * that any such output gets printed.
- */
-static int console_cpu_notify(struct notifier_block *self,
-	unsigned long action, void *hcpu)
-{
-	switch (action) {
-	case CPU_ONLINE:
-	case CPU_DEAD:
-	case CPU_DOWN_FAILED:
-	case CPU_UP_CANCELED:
-		console_lock();
-		console_unlock();
-	}
-	return NOTIFY_OK;
-}
-
-/**
- * console_lock - lock the console system for exclusive use.
- *
- * Acquires a lock which guarantees that the caller has
- * exclusive access to the console system and the console_drivers list.
- *
- * Can sleep, returns nothing.
- */
-void console_lock(void)
-{
-	might_sleep();
-
-	down(&console_sem);
-	if (console_suspended)
-		return;
-	console_locked = 1;
-	console_may_schedule = 1;
-	mutex_acquire(&console_lock_dep_map, 0, 0, _RET_IP_);
-}
-EXPORT_SYMBOL(console_lock);
-
-/**
- * console_trylock - try to lock the console system for exclusive use.
- *
- * Tried to acquire a lock which guarantees that the caller has
- * exclusive access to the console system and the console_drivers list.
- *
- * returns 1 on success, and 0 on failure to acquire the lock.
- */
-int console_trylock(void)
-{
-	if (down_trylock(&console_sem))
-		return 0;
-	if (console_suspended) {
-		up(&console_sem);
-		return 0;
-	}
-	console_locked = 1;
-	console_may_schedule = 0;
-	mutex_acquire(&console_lock_dep_map, 0, 1, _RET_IP_);
-	return 1;
-}
-EXPORT_SYMBOL(console_trylock);
-
-int is_console_locked(void)
-{
-	return console_locked;
-}
-
-static void console_cont_flush(char *text, size_t size)
-{
-	unsigned long flags;
-	size_t len;
-
-	raw_spin_lock_irqsave(&logbuf_lock, flags);
-
-	if (!cont.len)
-		goto out;
-
-	/*
-	 * We still queue earlier records, likely because the console was
-	 * busy. The earlier ones need to be printed before this one, we
-	 * did not flush any fragment so far, so just let it queue up.
-	 */
-	if (console_seq < log_next_seq && !cont.cons)
-		goto out;
-
-	len = cont_print_text(text, size);
-	raw_spin_unlock(&logbuf_lock);
-	stop_critical_timings();
-	call_console_drivers(cont.level, text, len);
-	start_critical_timings();
-	local_irq_restore(flags);
-	return;
-out:
-	raw_spin_unlock_irqrestore(&logbuf_lock, flags);
-}
-
-/**
- * console_unlock - unlock the console system
- *
- * Releases the console_lock which the caller holds on the console system
- * and the console driver list.
- *
- * While the console_lock was held, console output may have been buffered
- * by printk().  If this is the case, console_unlock(); emits
- * the output prior to releasing the lock.
- *
- * If there is output waiting, we wake /dev/kmsg and syslog() users.
- *
- * console_unlock(); may be called from any context.
- */
-void console_unlock(void)
-{
-	static char text[LOG_LINE_MAX + PREFIX_MAX];
-	static u64 seen_seq;
-	unsigned long flags;
-	bool wake_klogd = false;
-	bool retry;
-
-	if (console_suspended) {
-		up(&console_sem);
-		return;
-	}
-
-	console_may_schedule = 0;
-
-	/* flush buffered message fragment immediately to console */
-	console_cont_flush(text, sizeof(text));
-again:
-	for (;;) {
-		struct log *msg;
-		size_t len;
-		int level;
-
-		raw_spin_lock_irqsave(&logbuf_lock, flags);
-		if (seen_seq != log_next_seq) {
-			wake_klogd = true;
-			seen_seq = log_next_seq;
-		}
-
-		if (console_seq < log_first_seq) {
-			/* messages are gone, move to first one */
-			console_seq = log_first_seq;
-			console_idx = log_first_idx;
-			console_prev = 0;
-		}
-skip:
-		if (console_seq == log_next_seq)
-			break;
-
-		msg = log_from_idx(console_idx);
-		if (msg->flags & LOG_NOCONS) {
-			/*
-			 * Skip record we have buffered and already printed
-			 * directly to the console when we received it.
-			 */
-			console_idx = log_next(console_idx);
-			console_seq++;
-			/*
-			 * We will get here again when we register a new
-			 * CON_PRINTBUFFER console. Clear the flag so we
-			 * will properly dump everything later.
-			 */
-			msg->flags &= ~LOG_NOCONS;
-			console_prev = msg->flags;
-			goto skip;
-		}
-
-		level = msg->level;
-		len = msg_print_text(msg, console_prev, false,
-				     text, sizeof(text));
-		console_idx = log_next(console_idx);
-		console_seq++;
-		console_prev = msg->flags;
-		raw_spin_unlock(&logbuf_lock);
-
-		stop_critical_timings();	/* don't trace print latency */
-		call_console_drivers(level, text, len);
-		start_critical_timings();
-		local_irq_restore(flags);
-	}
-	console_locked = 0;
-	mutex_release(&console_lock_dep_map, 1, _RET_IP_);
-
-	/* Release the exclusive_console once it is used */
-	if (unlikely(exclusive_console))
-		exclusive_console = NULL;
-
-	raw_spin_unlock(&logbuf_lock);
-
-	up(&console_sem);
-
-	/*
-	 * Someone could have filled up the buffer again, so re-check if there's
-	 * something to flush. In case we cannot trylock the console_sem again,
-	 * there's a new owner and the console_unlock() from them will do the
-	 * flush, no worries.
-	 */
-	raw_spin_lock(&logbuf_lock);
-	retry = console_seq != log_next_seq;
-	raw_spin_unlock_irqrestore(&logbuf_lock, flags);
-
-	if (retry && console_trylock())
-		goto again;
-
-	if (wake_klogd)
-		wake_up_klogd();
-}
-EXPORT_SYMBOL(console_unlock);
-
-/**
- * console_conditional_schedule - yield the CPU if required
- *
- * If the console code is currently allowed to sleep, and
- * if this CPU should yield the CPU to another task, do
- * so here.
- *
- * Must be called within console_lock();.
- */
-void __sched console_conditional_schedule(void)
-{
-	if (console_may_schedule)
-		cond_resched();
-}
-EXPORT_SYMBOL(console_conditional_schedule);
-
-void console_unblank(void)
-{
-	struct console *c;
-
-	/*
-	 * console_unblank can no longer be called in interrupt context unless
-	 * oops_in_progress is set to 1..
-	 */
-	if (oops_in_progress) {
-		if (down_trylock(&console_sem) != 0)
-			return;
-	} else
-		console_lock();
-
-	console_locked = 1;
-	console_may_schedule = 0;
-	for_each_console(c)
-		if ((c->flags & CON_ENABLED) && c->unblank)
-			c->unblank();
-	console_unlock();
-}
-
-/*
- * Return the console tty driver structure and its associated index
- */
-struct tty_driver *console_device(int *index)
-{
-	struct console *c;
-	struct tty_driver *driver = NULL;
-
-	console_lock();
-	for_each_console(c) {
-		if (!c->device)
-			continue;
-		driver = c->device(c, index);
-		if (driver)
-			break;
-	}
-	console_unlock();
-	return driver;
-}
-
-/*
- * Prevent further output on the passed console device so that (for example)
- * serial drivers can disable console output before suspending a port, and can
- * re-enable output afterwards.
- */
-void console_stop(struct console *console)
-{
-	console_lock();
-	console->flags &= ~CON_ENABLED;
-	console_unlock();
-}
-EXPORT_SYMBOL(console_stop);
-
-void console_start(struct console *console)
-{
-	console_lock();
-	console->flags |= CON_ENABLED;
-	console_unlock();
-}
-EXPORT_SYMBOL(console_start);
-
-static int __read_mostly keep_bootcon;
-
-static int __init keep_bootcon_setup(char *str)
-{
-	keep_bootcon = 1;
-	printk(KERN_INFO "debug: skip boot console de-registration.\n");
-
-	return 0;
-}
-
-early_param("keep_bootcon", keep_bootcon_setup);
-
-/*
- * The console driver calls this routine during kernel initialization
- * to register the console printing procedure with printk() and to
- * print any messages that were printed by the kernel before the
- * console driver was initialized.
- *
- * This can happen pretty early during the boot process (because of
- * early_printk) - sometimes before setup_arch() completes - be careful
- * of what kernel features are used - they may not be initialised yet.
- *
- * There are two types of consoles - bootconsoles (early_printk) and
- * "real" consoles (everything which is not a bootconsole) which are
- * handled differently.
- *  - Any number of bootconsoles can be registered at any time.
- *  - As soon as a "real" console is registered, all bootconsoles
- *    will be unregistered automatically.
- *  - Once a "real" console is registered, any attempt to register a
- *    bootconsoles will be rejected
- */
-void register_console(struct console *newcon)
-{
-	int i;
-	unsigned long flags;
-	struct console *bcon = NULL;
-
-	/*
-	 * before we register a new CON_BOOT console, make sure we don't
-	 * already have a valid console
-	 */
-	if (console_drivers && newcon->flags & CON_BOOT) {
-		/* find the last or real console */
-		for_each_console(bcon) {
-			if (!(bcon->flags & CON_BOOT)) {
-				printk(KERN_INFO "Too late to register bootconsole %s%d\n",
-					newcon->name, newcon->index);
-				return;
-			}
-		}
-	}
-
-	if (console_drivers && console_drivers->flags & CON_BOOT)
-		bcon = console_drivers;
-
-	if (preferred_console < 0 || bcon || !console_drivers)
-		preferred_console = selected_console;
-
-	if (newcon->early_setup)
-		newcon->early_setup();
-
-	/*
-	 *	See if we want to use this console driver. If we
-	 *	didn't select a console we take the first one
-	 *	that registers here.
-	 */
-	if (preferred_console < 0) {
-		if (newcon->index < 0)
-			newcon->index = 0;
-		if (newcon->setup == NULL ||
-		    newcon->setup(newcon, NULL) == 0) {
-			newcon->flags |= CON_ENABLED;
-			if (newcon->device) {
-				newcon->flags |= CON_CONSDEV;
-				preferred_console = 0;
-			}
-		}
-	}
-
-	/*
-	 *	See if this console matches one we selected on
-	 *	the command line.
-	 */
-	for (i = 0; i < MAX_CMDLINECONSOLES && console_cmdline[i].name[0];
-			i++) {
-		if (strcmp(console_cmdline[i].name, newcon->name) != 0)
-			continue;
-		if (newcon->index >= 0 &&
-		    newcon->index != console_cmdline[i].index)
-			continue;
-		if (newcon->index < 0)
-			newcon->index = console_cmdline[i].index;
-#ifdef CONFIG_A11Y_BRAILLE_CONSOLE
-		if (console_cmdline[i].brl_options) {
-			newcon->flags |= CON_BRL;
-			braille_register_console(newcon,
-					console_cmdline[i].index,
-					console_cmdline[i].options,
-					console_cmdline[i].brl_options);
-			return;
-		}
-#endif
-		if (newcon->setup &&
-		    newcon->setup(newcon, console_cmdline[i].options) != 0)
-			break;
-		newcon->flags |= CON_ENABLED;
-		newcon->index = console_cmdline[i].index;
-		if (i == selected_console) {
-			newcon->flags |= CON_CONSDEV;
-			preferred_console = selected_console;
-		}
-		break;
-	}
-
-	if (!(newcon->flags & CON_ENABLED))
-		return;
-
-	/*
-	 * If we have a bootconsole, and are switching to a real console,
-	 * don't print everything out again, since when the boot console, and
-	 * the real console are the same physical device, it's annoying to
-	 * see the beginning boot messages twice
-	 */
-	if (bcon && ((newcon->flags & (CON_CONSDEV | CON_BOOT)) == CON_CONSDEV))
-		newcon->flags &= ~CON_PRINTBUFFER;
-
-	/*
-	 *	Put this console in the list - keep the
-	 *	preferred driver at the head of the list.
-	 */
-	console_lock();
-	if ((newcon->flags & CON_CONSDEV) || console_drivers == NULL) {
-		newcon->next = console_drivers;
-		console_drivers = newcon;
-		if (newcon->next)
-			newcon->next->flags &= ~CON_CONSDEV;
-	} else {
-		newcon->next = console_drivers->next;
-		console_drivers->next = newcon;
-	}
-	if (newcon->flags & CON_PRINTBUFFER) {
-		/*
-		 * console_unlock(); will print out the buffered messages
-		 * for us.
-		 */
-		raw_spin_lock_irqsave(&logbuf_lock, flags);
-		console_seq = syslog_seq;
-		console_idx = syslog_idx;
-		console_prev = syslog_prev;
-		raw_spin_unlock_irqrestore(&logbuf_lock, flags);
-		/*
-		 * We're about to replay the log buffer.  Only do this to the
-		 * just-registered console to avoid excessive message spam to
-		 * the already-registered consoles.
-		 */
-		exclusive_console = newcon;
-	}
-	console_unlock();
-	console_sysfs_notify();
-
-	/*
-	 * By unregistering the bootconsoles after we enable the real console
-	 * we get the "console xxx enabled" message on all the consoles -
-	 * boot consoles, real consoles, etc - this is to ensure that end
-	 * users know there might be something in the kernel's log buffer that
-	 * went to the bootconsole (that they do not see on the real console)
-	 */
-	if (bcon &&
-	    ((newcon->flags & (CON_CONSDEV | CON_BOOT)) == CON_CONSDEV) &&
-	    !keep_bootcon) {
-		/* we need to iterate through twice, to make sure we print
-		 * everything out, before we unregister the console(s)
-		 */
-		printk(KERN_INFO "console [%s%d] enabled, bootconsole disabled\n",
-			newcon->name, newcon->index);
-		for_each_console(bcon)
-			if (bcon->flags & CON_BOOT)
-				unregister_console(bcon);
-	} else {
-		printk(KERN_INFO "%sconsole [%s%d] enabled\n",
-			(newcon->flags & CON_BOOT) ? "boot" : "" ,
-			newcon->name, newcon->index);
-	}
-}
-EXPORT_SYMBOL(register_console);
-
-int unregister_console(struct console *console)
-{
-        struct console *a, *b;
-	int res = 1;
-
-#ifdef CONFIG_A11Y_BRAILLE_CONSOLE
-	if (console->flags & CON_BRL)
-		return braille_unregister_console(console);
-#endif
-
-	console_lock();
-	if (console_drivers == console) {
-		console_drivers=console->next;
-		res = 0;
-	} else if (console_drivers) {
-		for (a=console_drivers->next, b=console_drivers ;
-		     a; b=a, a=b->next) {
-			if (a == console) {
-				b->next = a->next;
-				res = 0;
-				break;
-			}
-		}
-	}
-
-	/*
-	 * If this isn't the last console and it has CON_CONSDEV set, we
-	 * need to set it on the next preferred console.
-	 */
-	if (console_drivers != NULL && console->flags & CON_CONSDEV)
-		console_drivers->flags |= CON_CONSDEV;
-
-	console_unlock();
-	console_sysfs_notify();
-	return res;
-}
-EXPORT_SYMBOL(unregister_console);
-
-static int __init printk_late_init(void)
-{
-	struct console *con;
-
-	for_each_console(con) {
-		if (!keep_bootcon && con->flags & CON_BOOT) {
-			printk(KERN_INFO "turn off boot console %s%d\n",
-				con->name, con->index);
-			unregister_console(con);
-		}
-	}
-	hotcpu_notifier(console_cpu_notify, 0);
-	return 0;
-}
-late_initcall(printk_late_init);
-
-#if defined CONFIG_PRINTK
-/*
- * Delayed printk version, for scheduler-internal messages:
- */
-#define PRINTK_BUF_SIZE		512
-
-#define PRINTK_PENDING_WAKEUP	0x01
-#define PRINTK_PENDING_SCHED	0x02
-
-static DEFINE_PER_CPU(int, printk_pending);
-static DEFINE_PER_CPU(char [PRINTK_BUF_SIZE], printk_sched_buf);
-
-static void wake_up_klogd_work_func(struct irq_work *irq_work)
-{
-	int pending = __this_cpu_xchg(printk_pending, 0);
-
-	if (pending & PRINTK_PENDING_SCHED) {
-		char *buf = __get_cpu_var(printk_sched_buf);
-		printk(KERN_WARNING "[sched_delayed] %s", buf);
-	}
-
-	if (pending & PRINTK_PENDING_WAKEUP)
-		wake_up_interruptible(&log_wait);
-}
-
-static DEFINE_PER_CPU(struct irq_work, wake_up_klogd_work) = {
-	.func = wake_up_klogd_work_func,
-	.flags = IRQ_WORK_LAZY,
-};
-
-void wake_up_klogd(void)
-{
-	preempt_disable();
-	if (waitqueue_active(&log_wait)) {
-		this_cpu_or(printk_pending, PRINTK_PENDING_WAKEUP);
-		irq_work_queue(&__get_cpu_var(wake_up_klogd_work));
-	}
-	preempt_enable();
-}
-
-int printk_sched(const char *fmt, ...)
-{
-	unsigned long flags;
-	va_list args;
-	char *buf;
-	int r;
-
-	local_irq_save(flags);
-	buf = __get_cpu_var(printk_sched_buf);
-
-	va_start(args, fmt);
-	r = vsnprintf(buf, PRINTK_BUF_SIZE, fmt, args);
-	va_end(args);
-
-	__this_cpu_or(printk_pending, PRINTK_PENDING_SCHED);
-	irq_work_queue(&__get_cpu_var(wake_up_klogd_work));
-	local_irq_restore(flags);
-
-	return r;
-}
-
-/*
- * printk rate limiting, lifted from the networking subsystem.
- *
- * This enforces a rate limit: not more than 10 kernel messages
- * every 5s to make a denial-of-service attack impossible.
- */
-DEFINE_RATELIMIT_STATE(printk_ratelimit_state, 5 * HZ, 10);
-
-int __printk_ratelimit(const char *func)
-{
-	return ___ratelimit(&printk_ratelimit_state, func);
-}
-EXPORT_SYMBOL(__printk_ratelimit);
-
-/**
- * printk_timed_ratelimit - caller-controlled printk ratelimiting
- * @caller_jiffies: pointer to caller's state
- * @interval_msecs: minimum interval between prints
- *
- * printk_timed_ratelimit() returns true if more than @interval_msecs
- * milliseconds have elapsed since the last time printk_timed_ratelimit()
- * returned true.
- */
-bool printk_timed_ratelimit(unsigned long *caller_jiffies,
-			unsigned int interval_msecs)
-{
-	if (*caller_jiffies == 0
-			|| !time_in_range(jiffies, *caller_jiffies,
-					*caller_jiffies
-					+ msecs_to_jiffies(interval_msecs))) {
-		*caller_jiffies = jiffies;
-		return true;
-	}
-	return false;
-}
-EXPORT_SYMBOL(printk_timed_ratelimit);
-
-static DEFINE_SPINLOCK(dump_list_lock);
-static LIST_HEAD(dump_list);
-
-/**
- * kmsg_dump_register - register a kernel log dumper.
- * @dumper: pointer to the kmsg_dumper structure
- *
- * Adds a kernel log dumper to the system. The dump callback in the
- * structure will be called when the kernel oopses or panics and must be
- * set. Returns zero on success and %-EINVAL or %-EBUSY otherwise.
- */
-int kmsg_dump_register(struct kmsg_dumper *dumper)
-{
-	unsigned long flags;
-	int err = -EBUSY;
-
-	/* The dump callback needs to be set */
-	if (!dumper->dump)
-		return -EINVAL;
-
-	spin_lock_irqsave(&dump_list_lock, flags);
-	/* Don't allow registering multiple times */
-	if (!dumper->registered) {
-		dumper->registered = 1;
-		list_add_tail_rcu(&dumper->list, &dump_list);
-		err = 0;
-	}
-	spin_unlock_irqrestore(&dump_list_lock, flags);
-
-	return err;
-}
-EXPORT_SYMBOL_GPL(kmsg_dump_register);
-
-/**
- * kmsg_dump_unregister - unregister a kmsg dumper.
- * @dumper: pointer to the kmsg_dumper structure
- *
- * Removes a dump device from the system. Returns zero on success and
- * %-EINVAL otherwise.
- */
-int kmsg_dump_unregister(struct kmsg_dumper *dumper)
-{
-	unsigned long flags;
-	int err = -EINVAL;
-
-	spin_lock_irqsave(&dump_list_lock, flags);
-	if (dumper->registered) {
-		dumper->registered = 0;
-		list_del_rcu(&dumper->list);
-		err = 0;
-	}
-	spin_unlock_irqrestore(&dump_list_lock, flags);
-	synchronize_rcu();
-
-	return err;
-}
-EXPORT_SYMBOL_GPL(kmsg_dump_unregister);
-
-static bool always_kmsg_dump;
-module_param_named(always_kmsg_dump, always_kmsg_dump, bool, S_IRUGO | S_IWUSR);
-
-/**
- * kmsg_dump - dump kernel log to kernel message dumpers.
- * @reason: the reason (oops, panic etc) for dumping
- *
- * Call each of the registered dumper's dump() callback, which can
- * retrieve the kmsg records with kmsg_dump_get_line() or
- * kmsg_dump_get_buffer().
- */
-void kmsg_dump(enum kmsg_dump_reason reason)
-{
-	struct kmsg_dumper *dumper;
-	unsigned long flags;
-
-	if ((reason > KMSG_DUMP_OOPS) && !always_kmsg_dump)
-		return;
-
-	rcu_read_lock();
-	list_for_each_entry_rcu(dumper, &dump_list, list) {
-		if (dumper->max_reason && reason > dumper->max_reason)
-			continue;
-
-		/* initialize iterator with data about the stored records */
-		dumper->active = true;
-
-		raw_spin_lock_irqsave(&logbuf_lock, flags);
-		dumper->cur_seq = clear_seq;
-		dumper->cur_idx = clear_idx;
-		dumper->next_seq = log_next_seq;
-		dumper->next_idx = log_next_idx;
-		raw_spin_unlock_irqrestore(&logbuf_lock, flags);
-
-		/* invoke dumper which will iterate over records */
-		dumper->dump(dumper, reason);
-
-		/* reset iterator */
-		dumper->active = false;
-	}
-	rcu_read_unlock();
-}
-
-/**
- * kmsg_dump_get_line_nolock - retrieve one kmsg log line (unlocked version)
- * @dumper: registered kmsg dumper
- * @syslog: include the "<4>" prefixes
- * @line: buffer to copy the line to
- * @size: maximum size of the buffer
- * @len: length of line placed into buffer
- *
- * Start at the beginning of the kmsg buffer, with the oldest kmsg
- * record, and copy one record into the provided buffer.
- *
- * Consecutive calls will return the next available record moving
- * towards the end of the buffer with the youngest messages.
- *
- * A return value of FALSE indicates that there are no more records to
- * read.
- *
- * The function is similar to kmsg_dump_get_line(), but grabs no locks.
- */
-bool kmsg_dump_get_line_nolock(struct kmsg_dumper *dumper, bool syslog,
-			       char *line, size_t size, size_t *len)
-{
-	struct log *msg;
-	size_t l = 0;
-	bool ret = false;
-
-	if (!dumper->active)
-		goto out;
-
-	if (dumper->cur_seq < log_first_seq) {
-		/* messages are gone, move to first available one */
-		dumper->cur_seq = log_first_seq;
-		dumper->cur_idx = log_first_idx;
-	}
-
-	/* last entry */
-	if (dumper->cur_seq >= log_next_seq)
-		goto out;
-
-	msg = log_from_idx(dumper->cur_idx);
-	l = msg_print_text(msg, 0, syslog, line, size);
-
-	dumper->cur_idx = log_next(dumper->cur_idx);
-	dumper->cur_seq++;
-	ret = true;
-out:
-	if (len)
-		*len = l;
-	return ret;
-}
-
-/**
- * kmsg_dump_get_line - retrieve one kmsg log line
- * @dumper: registered kmsg dumper
- * @syslog: include the "<4>" prefixes
- * @line: buffer to copy the line to
- * @size: maximum size of the buffer
- * @len: length of line placed into buffer
- *
- * Start at the beginning of the kmsg buffer, with the oldest kmsg
- * record, and copy one record into the provided buffer.
- *
- * Consecutive calls will return the next available record moving
- * towards the end of the buffer with the youngest messages.
- *
- * A return value of FALSE indicates that there are no more records to
- * read.
- */
-bool kmsg_dump_get_line(struct kmsg_dumper *dumper, bool syslog,
-			char *line, size_t size, size_t *len)
-{
-	unsigned long flags;
-	bool ret;
-
-	raw_spin_lock_irqsave(&logbuf_lock, flags);
-	ret = kmsg_dump_get_line_nolock(dumper, syslog, line, size, len);
-	raw_spin_unlock_irqrestore(&logbuf_lock, flags);
-
-	return ret;
-}
-EXPORT_SYMBOL_GPL(kmsg_dump_get_line);
-
-/**
- * kmsg_dump_get_buffer - copy kmsg log lines
- * @dumper: registered kmsg dumper
- * @syslog: include the "<4>" prefixes
- * @buf: buffer to copy the line to
- * @size: maximum size of the buffer
- * @len: length of line placed into buffer
- *
- * Start at the end of the kmsg buffer and fill the provided buffer
- * with as many of the the *youngest* kmsg records that fit into it.
- * If the buffer is large enough, all available kmsg records will be
- * copied with a single call.
- *
- * Consecutive calls will fill the buffer with the next block of
- * available older records, not including the earlier retrieved ones.
- *
- * A return value of FALSE indicates that there are no more records to
- * read.
- */
-bool kmsg_dump_get_buffer(struct kmsg_dumper *dumper, bool syslog,
-			  char *buf, size_t size, size_t *len)
-{
-	unsigned long flags;
-	u64 seq;
-	u32 idx;
-	u64 next_seq;
-	u32 next_idx;
-	enum log_flags prev;
-	size_t l = 0;
-	bool ret = false;
-
-	if (!dumper->active)
-		goto out;
-
-	raw_spin_lock_irqsave(&logbuf_lock, flags);
-	if (dumper->cur_seq < log_first_seq) {
-		/* messages are gone, move to first available one */
-		dumper->cur_seq = log_first_seq;
-		dumper->cur_idx = log_first_idx;
-	}
-
-	/* last entry */
-	if (dumper->cur_seq >= dumper->next_seq) {
-		raw_spin_unlock_irqrestore(&logbuf_lock, flags);
-		goto out;
-	}
-
-	/* calculate length of entire buffer */
-	seq = dumper->cur_seq;
-	idx = dumper->cur_idx;
-	prev = 0;
-	while (seq < dumper->next_seq) {
-		struct log *msg = log_from_idx(idx);
-
-		l += msg_print_text(msg, prev, true, NULL, 0);
-		idx = log_next(idx);
-		seq++;
-		prev = msg->flags;
-	}
-
-	/* move first record forward until length fits into the buffer */
-	seq = dumper->cur_seq;
-	idx = dumper->cur_idx;
-	prev = 0;
-	while (l > size && seq < dumper->next_seq) {
-		struct log *msg = log_from_idx(idx);
-
-		l -= msg_print_text(msg, prev, true, NULL, 0);
-		idx = log_next(idx);
-		seq++;
-		prev = msg->flags;
-	}
-
-	/* last message in next interation */
-	next_seq = seq;
-	next_idx = idx;
-
-	l = 0;
-	prev = 0;
-	while (seq < dumper->next_seq) {
-		struct log *msg = log_from_idx(idx);
-
-		l += msg_print_text(msg, prev, syslog, buf + l, size - l);
-		idx = log_next(idx);
-		seq++;
-		prev = msg->flags;
-	}
-
-	dumper->next_seq = next_seq;
-	dumper->next_idx = next_idx;
-	ret = true;
-	raw_spin_unlock_irqrestore(&logbuf_lock, flags);
-out:
-	if (len)
-		*len = l;
-	return ret;
-}
-EXPORT_SYMBOL_GPL(kmsg_dump_get_buffer);
-
-/**
- * kmsg_dump_rewind_nolock - reset the interator (unlocked version)
- * @dumper: registered kmsg dumper
- *
- * Reset the dumper's iterator so that kmsg_dump_get_line() and
- * kmsg_dump_get_buffer() can be called again and used multiple
- * times within the same dumper.dump() callback.
- *
- * The function is similar to kmsg_dump_rewind(), but grabs no locks.
- */
-void kmsg_dump_rewind_nolock(struct kmsg_dumper *dumper)
-{
-	dumper->cur_seq = clear_seq;
-	dumper->cur_idx = clear_idx;
-	dumper->next_seq = log_next_seq;
-	dumper->next_idx = log_next_idx;
-}
-
-/**
- * kmsg_dump_rewind - reset the interator
- * @dumper: registered kmsg dumper
- *
- * Reset the dumper's iterator so that kmsg_dump_get_line() and
- * kmsg_dump_get_buffer() can be called again and used multiple
- * times within the same dumper.dump() callback.
- */
-void kmsg_dump_rewind(struct kmsg_dumper *dumper)
-{
-	unsigned long flags;
-
-	raw_spin_lock_irqsave(&logbuf_lock, flags);
-	kmsg_dump_rewind_nolock(dumper);
-	raw_spin_unlock_irqrestore(&logbuf_lock, flags);
-}
-EXPORT_SYMBOL_GPL(kmsg_dump_rewind);
-
-static char dump_stack_arch_desc_str[128];
-
-/**
- * dump_stack_set_arch_desc - set arch-specific str to show with task dumps
- * @fmt: printf-style format string
- * @...: arguments for the format string
- *
- * The configured string will be printed right after utsname during task
- * dumps.  Usually used to add arch-specific system identifiers.  If an
- * arch wants to make use of such an ID string, it should initialize this
- * as soon as possible during boot.
- */
-void __init dump_stack_set_arch_desc(const char *fmt, ...)
-{
-	va_list args;
-
-	va_start(args, fmt);
-	vsnprintf(dump_stack_arch_desc_str, sizeof(dump_stack_arch_desc_str),
-		  fmt, args);
-	va_end(args);
-}
-
-/**
- * dump_stack_print_info - print generic debug info for dump_stack()
- * @log_lvl: log level
- *
- * Arch-specific dump_stack() implementations can use this function to
- * print out the same debug information as the generic dump_stack().
- */
-void dump_stack_print_info(const char *log_lvl)
-{
-	printk("%sCPU: %d PID: %d Comm: %.20s %s %s %.*s\n",
-	       log_lvl, raw_smp_processor_id(), current->pid, current->comm,
-	       print_tainted(), init_utsname()->release,
-	       (int)strcspn(init_utsname()->version, " "),
-	       init_utsname()->version);
-
-	if (dump_stack_arch_desc_str[0] != '\0')
-		printk("%sHardware name: %s\n",
-		       log_lvl, dump_stack_arch_desc_str);
-
-	print_worker_info(log_lvl, current);
-}
-
-/**
- * show_regs_print_info - print generic debug info for show_regs()
- * @log_lvl: log level
- *
- * show_regs() implementations can use this function to print out generic
- * debug information.
- */
-void show_regs_print_info(const char *log_lvl)
-{
-	dump_stack_print_info(log_lvl);
-
-	printk("%stask: %p ti: %p task.ti: %p\n",
-	       log_lvl, current, current_thread_info(),
-	       task_thread_info(current));
-}
-
-#endif