Commit 44a84da4 authored by Dylan Yudaken's avatar Dylan Yudaken Committed by Jens Axboe
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io_uring: use call_rcu_hurry if signaling an eventfd 



io_uring uses call_rcu in the case it needs to signal an eventfd as a
result of an eventfd signal, since recursing eventfd signals are not
allowed. This should be calling the new call_rcu_hurry API to not delay
the signal.

Signed-off-by: default avatarDylan Yudaken <dylany@meta.com>

Cc: Joel Fernandes (Google) <joel@joelfernandes.org>
Cc: Paul E. McKenney <paulmck@kernel.org>
Acked-by: default avatarPaul E. McKenney <paulmck@kernel.org>
Reviewed-by: default avatarJoel Fernandes (Google) <joel@joelfernandes.org>
Link: https://lore.kernel.org/r/20221215184138.795576-1-dylany@meta.com


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent a8cf95f9

io_uring/io_uring.c

+1 −1
Original line number Diff line number Diff line
@@ -538,7 +538,7 @@ static void io_eventfd_signal(struct io_ring_ctx *ctx) 
	} else {

		atomic_inc(&ev_fd->refs);

		if (!atomic_fetch_or(BIT(IO_EVENTFD_OP_SIGNAL_BIT), &ev_fd->ops))

			call_rcu(&ev_fd->rcu, io_eventfd_ops);

			call_rcu_hurry(&ev_fd->rcu, io_eventfd_ops);

		else

			atomic_dec(&ev_fd->refs);

	}