[PATCH 1/1] io_uring: more graceful request alloc OOM

[Pavel Begunkov <asml.silence@xxxxxxxxx>]

It's ok for io_uring request allocation to fail, however there are
reports that it starts killing tasks instead of just returning back
to the userspace. Add __GFP_NORETRY, so it doesn't trigger OOM killer.

Cc: stable@xxxxxxxxxxxxxxx
Fixes: 2b188cc1bb857 ("Add io_uring IO interface")
Reported-by: yang lan <lanyang0908@xxxxxxxxx>
Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx>
---
 io_uring/io_uring.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index dab09f568294..ad34a4320dab 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -1073,7 +1073,7 @@ static void io_flush_cached_locked_reqs(struct io_ring_ctx *ctx,
 __cold bool __io_alloc_req_refill(struct io_ring_ctx *ctx)
 	__must_hold(&ctx->uring_lock)
 {
-	gfp_t gfp = GFP_KERNEL | __GFP_NOWARN;
+	gfp_t gfp = GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY;
 	void *reqs[IO_REQ_ALLOC_BATCH];
 	int ret, i;
 
-- 
2.40.0