Commit f5f93541 authored Mar 23, 2023 by Mikulas Patocka Committed by Mike Snitzer Mar 30, 2023

dm bufio: use waitqueue_active in __free_buffer_wake



Save one spinlock by using waitqueue_active. We hold the bufio lock at
this place, so no one can add entries to the waitqueue at this point.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>

parent 530f683d

drivers/md/dm-bufio.c

+6 −1

Original line number	Diff line number	Diff line
		@@ -1665,6 +1665,11 @@ static void __free_buffer_wake(struct dm_buffer *b)
		c->need_reserved_buffers--;
		}

		/*
		* We hold the bufio lock here, so no one can add entries to the
		* wait queue anyway.
		*/
		if (unlikely(waitqueue_active(&c->free_buffer_wait)))
		wake_up(&c->free_buffer_wait);
		}