From: Bart Van Assche <bart.vanassche@sandisk.com>
Date: Tue, 20 Jun 2017 11:15:44 -0700
Subject: [PATCH] block: Add a comment above queue_lockdep_assert_held()
Git-commit: 9e0c829906b9aa1e7ad84689f2bcd56457bdb417
Patch-mainline: v4.13-rc1
References: bsc#1104967,FATE#325924
Add a comment above the queue_lockdep_assert_held() macro that
explains the purpose of the q->queue_lock test.
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Omar Sandoval <osandov@fb.com>
Cc: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Acked-by: Hannes Reinecke <hare@suse.com>
---
include/linux/blkdev.h | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 9a36164487d0..3e60e7a654bd 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -635,6 +635,13 @@ struct request_queue {
(1 << QUEUE_FLAG_SAME_COMP) | \
(1 << QUEUE_FLAG_POLL))
+/*
+ * @q->queue_lock is set while a queue is being initialized. Since we know
+ * that no other threads access the queue object before @q->queue_lock has
+ * been set, it is safe to manipulate queue flags without holding the
+ * queue_lock if @q->queue_lock == NULL. See also blk_alloc_queue_node() and
+ * blk_init_allocated_queue().
+ */
static inline void queue_lockdep_assert_held(struct request_queue *q)
{
if (q->queue_lock)
--
2.16.4