From: Andrew Morton <akpm@osdl.org>
Date: Wed, 9 May 2007 09:34:58 +0000 (-0700)
Subject: aio is unlikely
X-Git-Tag: v2.6.22-rc1~189
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=b8522ead3534c6cd06752b47a3bc380956191a2a;p=karo-tx-linux.git

aio is unlikely

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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/include/linux/aio.h b/include/linux/aio.h
index a30ef13c9e62..43dc2ebfaa0e 100644
--- a/include/linux/aio.h
+++ b/include/linux/aio.h
@@ -226,7 +226,8 @@ int FASTCALL(io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
 		__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 {									\