Commit fc5ff250 authored by Alexandre Negrel's avatar Alexandre Negrel Committed by Jens Axboe
Browse files

io_uring: use GFP_NOWAIT for overflow CQEs on legacy rings 

Allocate the overflowing CQE with GFP_NOWAIT instead of GFP_ATOMIC. This
changes causes allocations to fail earlier in out-of-memory situations,
rather than being deferred. Using GFP_ATOMIC allows a process to exceed
memory limits.

Closes: https://bugzilla.kernel.org/show_bug.cgi?id=220794


Signed-off-by: default avatarAlexandre Negrel <alexandre@negrel.dev>
Link: https://lore.kernel.org/io-uring/20251229201933.515797-1-alexandre@negrel.dev/


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent b14fad55

io_uring/io_uring.c

+1 −1
Original line number Diff line number Diff line
@@ -864,7 +864,7 @@ static __cold bool io_cqe_overflow_locked(struct io_ring_ctx *ctx, 
{

	struct io_overflow_cqe *ocqe;



	ocqe = io_alloc_ocqe(ctx, cqe, big_cqe, GFP_ATOMIC);

	ocqe = io_alloc_ocqe(ctx, cqe, big_cqe, GFP_NOWAIT);

	return io_cqring_add_overflow(ctx, ocqe);

}