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author | Thomas Petazzoni <thomas.petazzoni@free-electrons.com> | 2008-10-15 22:05:12 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-10-16 11:21:51 -0700 |
commit | ebf3f09c634906d371f2bfd71b41c7e0c52efe7e (patch) | |
tree | 4205040f47fba2675dc4c6b1407d15c9d6f8b355 | |
parent | d8273674721faaf84bec2190c0c7a82972b37f73 (diff) | |
download | lwn-ebf3f09c634906d371f2bfd71b41c7e0c52efe7e.tar.gz lwn-ebf3f09c634906d371f2bfd71b41c7e0c52efe7e.zip |
Configure out AIO support
This patchs adds the CONFIG_AIO option which allows to remove support
for asynchronous I/O operations, that are not necessarly used by
applications, particularly on embedded devices. As this is a
size-reduction option, it depends on CONFIG_EMBEDDED. It allows to
save ~7 kilobytes of kernel code/data:
text data bss dec hex filename
1115067 119180 217088 1451335 162547 vmlinux
1108025 119048 217088 1444161 160941 vmlinux.new
-7042 -132 0 -7174 -1C06 +/-
This patch has been originally written by Matt Mackall
<mpm@selenic.com>, and is part of the Linux Tiny project.
[randy.dunlap@oracle.com: build fix]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: Zach Brown <zach.brown@oracle.com>
Signed-off-by: Matt Mackall <mpm@selenic.com>
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r-- | fs/Makefile | 3 | ||||
-rw-r--r-- | include/linux/aio.h | 9 | ||||
-rw-r--r-- | init/Kconfig | 8 | ||||
-rw-r--r-- | kernel/sys_ni.c | 5 | ||||
-rw-r--r-- | kernel/sysctl.c | 2 |
5 files changed, 26 insertions, 1 deletions
diff --git a/fs/Makefile b/fs/Makefile index b6f27dc26b72..d0c69f57e5bf 100644 --- a/fs/Makefile +++ b/fs/Makefile @@ -8,7 +8,7 @@ obj-y := open.o read_write.o file_table.o super.o \ char_dev.o stat.o exec.o pipe.o namei.o fcntl.o \ ioctl.o readdir.o select.o fifo.o dcache.o inode.o \ - attr.o bad_inode.o file.o filesystems.o namespace.o aio.o \ + attr.o bad_inode.o file.o filesystems.o namespace.o \ seq_file.o xattr.o libfs.o fs-writeback.o \ pnode.o drop_caches.o splice.o sync.o utimes.o \ stack.o @@ -27,6 +27,7 @@ obj-$(CONFIG_ANON_INODES) += anon_inodes.o obj-$(CONFIG_SIGNALFD) += signalfd.o obj-$(CONFIG_TIMERFD) += timerfd.o obj-$(CONFIG_EVENTFD) += eventfd.o +obj-$(CONFIG_AIO) += aio.o obj-$(CONFIG_FILE_LOCKING) += locks.o obj-$(CONFIG_COMPAT) += compat.o compat_ioctl.o diff --git a/include/linux/aio.h b/include/linux/aio.h index 09b276c35227..f6b8cf99b596 100644 --- a/include/linux/aio.h +++ b/include/linux/aio.h @@ -204,12 +204,21 @@ struct kioctx { /* prototypes */ extern unsigned aio_max_size; +#ifdef CONFIG_AIO extern ssize_t wait_on_sync_kiocb(struct kiocb *iocb); extern int aio_put_req(struct kiocb *iocb); extern void kick_iocb(struct kiocb *iocb); extern int aio_complete(struct kiocb *iocb, long res, long res2); struct mm_struct; extern void exit_aio(struct mm_struct *mm); +#else +static inline ssize_t wait_on_sync_kiocb(struct kiocb *iocb) { return 0; } +static inline int aio_put_req(struct kiocb *iocb) { return 0; } +static inline void kick_iocb(struct kiocb *iocb) { } +static inline int aio_complete(struct kiocb *iocb, long res, long res2) { return 0; } +struct mm_struct; +static inline void exit_aio(struct mm_struct *mm) { } +#endif /* CONFIG_AIO */ #define io_wait_to_kiocb(wait) container_of(wait, struct kiocb, ki_wait) diff --git a/init/Kconfig b/init/Kconfig index 8a8e2d00c40e..5ceff3249a2d 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -713,6 +713,14 @@ config SHMEM option replaces shmem and tmpfs with the much simpler ramfs code, which may be appropriate on small systems without swap. +config AIO + bool "Enable AIO support" if EMBEDDED + default y + help + This option enables POSIX asynchronous I/O which may by used + by some high performance threaded applications. Disabling + this option saves about 7k. + config VM_EVENT_COUNTERS default y bool "Enable VM event counters for /proc/vmstat" if EMBEDDED diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c index 503d8d4eb80a..a77b27b11b04 100644 --- a/kernel/sys_ni.c +++ b/kernel/sys_ni.c @@ -126,6 +126,11 @@ cond_syscall(sys_vm86); cond_syscall(compat_sys_ipc); cond_syscall(compat_sys_sysctl); cond_syscall(sys_flock); +cond_syscall(sys_io_setup); +cond_syscall(sys_io_destroy); +cond_syscall(sys_io_submit); +cond_syscall(sys_io_cancel); +cond_syscall(sys_io_getevents); /* arch-specific weak syscall entries */ cond_syscall(sys_pciconfig_read); diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 9792c315676a..617d41e4d6a0 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -1281,6 +1281,7 @@ static struct ctl_table fs_table[] = { .extra2 = &two, }, #endif +#ifdef CONFIG_AIO { .procname = "aio-nr", .data = &aio_nr, @@ -1295,6 +1296,7 @@ static struct ctl_table fs_table[] = { .mode = 0644, .proc_handler = &proc_doulongvec_minmax, }, +#endif /* CONFIG_AIO */ #ifdef CONFIG_INOTIFY_USER { .ctl_name = FS_INOTIFY, |