Instead of smp_mb() + __io_cqring_wake() in __io_cq_unlock_post_flush()
use equivalent io_cqring_wake(). With that we can clean it up further
and remove __io_cqring_wake().
Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx>
---
io_uring/io_uring.c | 6 ++----
io_uring/io_uring.h | 11 ++---------
2 files changed, 4 insertions(+), 13 deletions(-)
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index fb7215b543cd..d4ac62de2113 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -640,10 +640,8 @@ static inline void __io_cq_unlock_post_flush(struct io_ring_ctx *ctx)
* it will re-check the wakeup conditions once we return we can safely
* skip waking it up.
*/
- if (!(ctx->flags & IORING_SETUP_DEFER_TASKRUN)) {
- smp_mb();
- __io_cqring_wake(ctx);
- }
+ if (!(ctx->flags & IORING_SETUP_DEFER_TASKRUN))
+ io_cqring_wake(ctx);
}
void io_cq_unlock_post(struct io_ring_ctx *ctx)
diff --git a/io_uring/io_uring.h b/io_uring/io_uring.h
index 193b2db39fe8..24d8196bbca3 100644
--- a/io_uring/io_uring.h
+++ b/io_uring/io_uring.h
@@ -228,8 +228,7 @@ static inline void io_poll_wq_wake(struct io_ring_ctx *ctx)
poll_to_key(EPOLL_URING_WAKE | EPOLLIN));
}
-/* requires smb_mb() prior, see wq_has_sleeper() */
-static inline void __io_cqring_wake(struct io_ring_ctx *ctx)
+static inline void io_cqring_wake(struct io_ring_ctx *ctx)
{
/*
* Trigger waitqueue handler on all waiters on our waitqueue. This
@@ -241,17 +240,11 @@ static inline void __io_cqring_wake(struct io_ring_ctx *ctx)
* waitqueue handlers, we know we have a dependency between eventfd or
* epoll and should terminate multishot poll at that point.
*/
- if (waitqueue_active(&ctx->cq_wait))
+ if (wq_has_sleeper(&ctx->cq_wait))
__wake_up(&ctx->cq_wait, TASK_NORMAL, 0,
poll_to_key(EPOLL_URING_WAKE | EPOLLIN));
}
-static inline void io_cqring_wake(struct io_ring_ctx *ctx)
-{
- smp_mb();
- __io_cqring_wake(ctx);
-}
-
static inline bool io_sqring_full(struct io_ring_ctx *ctx)
{
struct io_rings *r = ctx->rings;
--
2.40.0
