forked from luck/tmp_suning_uos_patched
[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>
This commit is contained in:
parent
212079cf4e
commit
4bf69b2a06
3
fs/aio.c
3
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;
|
||||
|
|
Loading…
Reference in New Issue
Block a user