From: Andrew Morton <akpm@osdl.org>

Stick an unlikely() around is_aio(): I assert that most IO is synchronous.

Cc: Suparna Bhattacharya <suparna@in.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: Zach Brown <zach.brown@oracle.com>
Cc: Ulrich Drepper <drepper@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/aio.h |    3 ++-
 1 files changed, 2 insertions(+), 1 deletion(-)

diff -puN include/linux/aio.h~aio-is-unlikely include/linux/aio.h
--- a/include/linux/aio.h~aio-is-unlikely
+++ a/include/linux/aio.h
@@ -226,7 +226,8 @@ int FASTCALL(io_submit_one(struct kioctx
 		__put_ioctx(kioctx);					\
 } while (0)
 
-#define in_aio() !is_sync_wait(current->io_wait)
+#define in_aio() (unlikely(!is_sync_wait(current->io_wait)))
+
 /* may be used for debugging */
 #define warn_if_async()							\
 do {									\
_