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| author | Rafael J. Wysocki <rjw@sisk.pl> | 2006-09-25 23:32:56 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-09-26 08:49:03 -0700 |
| commit | c8eb8b4025175f967af0ba8e933f23aa9954dc35 (patch) | |
| tree | 1e7dcfe6472aa0cae05651e375bebb3e7b5b9eb8 /kernel | |
| parent | 940864ddabdb180e02041c4dcd46ba6f9eee732f (diff) | |
| download | lwn-c8eb8b4025175f967af0ba8e933f23aa9954dc35.tar.gz lwn-c8eb8b4025175f967af0ba8e933f23aa9954dc35.zip | |
[PATCH] PM: make it possible to disable console suspending
Change suspend_console() so that it waits for all consoles to flush the
remaining messages and make it possible to switch the console suspending off
with the help of a Kconfig option.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Cc: Stefan Seyfried <seife@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/power/Kconfig | 11 | ||||
| -rw-r--r-- | kernel/printk.c | 3 |
2 files changed, 14 insertions, 0 deletions
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig index 619ecabf7c58..4b6e2f18e056 100644 --- a/kernel/power/Kconfig +++ b/kernel/power/Kconfig @@ -36,6 +36,17 @@ config PM_DEBUG code. This is helpful when debugging and reporting various PM bugs, like suspend support. +config DISABLE_CONSOLE_SUSPEND + bool "Keep console(s) enabled during suspend/resume (DANGEROUS)" + depends on PM && PM_DEBUG + default n + ---help--- + This option turns off the console suspend mechanism that prevents + debug messages from reaching the console during the suspend/resume + operations. This may be helpful when debugging device drivers' + suspend/resume routines, but may itself lead to problems, for example + if netconsole is used. + config PM_TRACE bool "Suspend/resume event tracing" depends on PM && PM_DEBUG && X86_32 && EXPERIMENTAL diff --git a/kernel/printk.c b/kernel/printk.c index 1149365e989e..771f5e861bcd 100644 --- a/kernel/printk.c +++ b/kernel/printk.c @@ -721,6 +721,7 @@ int __init add_preferred_console(char *name, int idx, char *options) return 0; } +#ifndef CONFIG_DISABLE_CONSOLE_SUSPEND /** * suspend_console - suspend the console subsystem * @@ -728,6 +729,7 @@ int __init add_preferred_console(char *name, int idx, char *options) */ void suspend_console(void) { + printk("Suspending console(s)\n"); acquire_console_sem(); console_suspended = 1; } @@ -737,6 +739,7 @@ void resume_console(void) console_suspended = 0; release_console_sem(); } +#endif /* CONFIG_DISABLE_CONSOLE_SUSPEND */ /** * acquire_console_sem - lock the console system for exclusive use. |