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authorKen Chen <kenneth.w.chen@intel.com>2005-05-01 08:59:15 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-05-01 08:59:15 -0700
commit4bf69b2a06090c01c27f25ea5cd1440f7bf9256f (patch)
tree35bed1e865ee9f8b086954d866cee9c1c2b92b0f /fs
parent212079cf4ee99e492a57b817e796825d423a30bb (diff)
downloadlinux-stericsson-4bf69b2a06090c01c27f25ea5cd1440f7bf9256f.tar.gz
[PATCH] aio: ring wrapping simplification
Since the tail pointer in aio_ring structure never wrap ring size more than once, so a simple compare is sufficient to wrap the index around. This avoid a more expensive mod operation. Signed-off-by: Ken Chen <kenneth.w.chen@intel.com> Cc: Benjamin LaHaise <bcrl@kvack.org> Cc: Suparna Bhattacharya <suparna@in.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/aio.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/aio.c b/fs/aio.c
index 9f807a541fbe..40517f35daae 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -978,7 +978,8 @@ int fastcall aio_complete(struct kiocb *iocb, long res, long res2)
tail = info->tail;
event = aio_ring_event(info, tail, KM_IRQ0);
- tail = (tail + 1) % info->nr;
+ if (++tail >= info->nr)
+ tail = 0;
event->obj = (u64)(unsigned long)iocb->ki_obj.user;
event->data = iocb->ki_user_data;