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Configure out AIO support

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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>
This commit is contained in:
Thomas Petazzoni
2008-10-15 22:05:12 -07:00
committed by Linus Torvalds
parent d827367472
commit ebf3f09c63
5 changed files with 26 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
kernel/sys_ni.c
View File

@@ -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);

2
kernel/sysctl.c
View File

@@ -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,