In aio_read_evt(), the ring->head will never wrap info->nr because we already does the wrap when updating the ring head index:
if (head != ring->tail) { ... head = (head + 1) % info->nr; ring->head = head; } This makes the modulo of ring->head into local variable head unnecessary. This patch removes that bogus code. Signed-off-by: Ken Chen <[EMAIL PROTECTED]> --- ./fs/aio.c.orig 2006-12-24 22:01:36.000000000 -0800 +++ ./fs/aio.c 2006-12-24 22:34:48.000000000 -0800 @@ -1019,7 +1019,7 @@ static int aio_read_evt(struct kioctx *i { struct aio_ring_info *info = &ioctx->ring_info; struct aio_ring *ring; - unsigned long head; + unsigned int head; int ret = 0; ring = kmap_atomic(info->ring_pages[0], KM_USER0); @@ -1032,7 +1032,7 @@ static int aio_read_evt(struct kioctx *i spin_lock(&info->ring_lock); - head = ring->head % info->nr; + head = ring->head; if (head != ring->tail) { struct io_event *evp = aio_ring_event(info, head, KM_USER1); *ent = *evp; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/