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UPSTREAM: io_uring: use call_rcu_hurry if signaling an eventfd

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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: Dylan Yudaken <dylany@meta.com>

Cc: Joel Fernandes (Google) <joel@joelfernandes.org>
Cc: Paul E. McKenney <paulmck@kernel.org>
Acked-by: Paul E. McKenney <paulmck@kernel.org>
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Link: https://lore.kernel.org/r/20221215184138.795576-1-dylany@meta.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
(cherry picked from commit 44a84da45272b3f4beb90025a64cfbde18f1aef0)

Bug: 258241771
Signed-off-by: Joel Fernandes <joelaf@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/4909038
Reviewed-by: Vineeth Pillai <vineethrp@google.com>
Reviewed-by: Ross Zwisler <zwisler@google.com>
Reviewed-by: Sean Paul <sean@poorly.run>
Signed-off-by: Qais Yousef <qyousef@google.com>
Change-Id: Iec189c9ce0a95ccacda81f58bf7d49a575a6ab3f
This commit is contained in:
Dylan Yudaken 2022-12-15 10:41:38 -08:00 committed by Todd Kjos
parent 84c8157d06
commit ced65a053b
1 changed files with 1 additions and 1 deletions
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2
io_uring/io_uring.c
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@ -536,7 +536,7 @@ 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);
}