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| author | Stefan Bühler <source@stbuehler.de> | 2019-04-24 23:54:22 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-04-30 09:40:02 -0600 |
| commit | 62977281a6384d3904c02272a638cc3ac3bac54d (patch) | |
| tree | ab763641f1383af43668fd3d501fd606e90cd4ab | |
| parent | b841f19524a16cd93a39f9306191f85c549a2bc2 (diff) | |
| download | linux-62977281a6384d3904c02272a638cc3ac3bac54d.tar.gz | |
io_uring: remove unnecessary barrier after unsetting IORING_SQ_NEED_WAKEUP
There is no operation to order with afterwards, and removing the flag is not critical in any way. There will always be a "race condition" where the application will trigger IORING_ENTER_SQ_WAKEUP when it isn't actually needed. Signed-off-by: Stefan Bühler <source@stbuehler.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | fs/io_uring.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c index 2ebc33cc907b..77b247b5d10b 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -1969,13 +1969,11 @@ static int io_sq_thread(void *data) finish_wait(&ctx->sqo_wait, &wait); ctx->sq_ring->flags &= ~IORING_SQ_NEED_WAKEUP; - smp_wmb(); continue; } finish_wait(&ctx->sqo_wait, &wait); ctx->sq_ring->flags &= ~IORING_SQ_NEED_WAKEUP; - smp_wmb(); } i = 0; |