linux-kernel - [PATCH 2/3] block: Drop locking annotation for limits

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Message-Id: <20240614090345.655716-3-john.g.garry@oracle.com>
Date: Fri, 14 Jun 2024 09:03:44 +0000
From: John Garry <john.g.garry@...cle.com>
To: axboe@...nel.dk, paolo.valente@...more.it
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        jiapeng.chong@...ux.alibaba.com, hch@....de,
        John Garry <john.g.garry@...cle.com>
Subject: [PATCH 2/3] block: Drop locking annotation for limits_lock

Currently compiling block/blk-settings.c with C=1 gives the following
warning:
block/blk-settings.c:262:9: warning: context imbalance in 'queue_limits_commit_update' - wrong count at exit

request_queue.limits_lock is a mutex. Sparse locking annotation for
mutexes are currently not supported - see [0] - so drop that locking
annotation.

[0] https://lore.kernel.org/lkml/cover.1579893447.git.jbi.octave@gmail.com/T/#mbb8bda6c0a7ca7ce19f46df976a8e3b489745488

Fixes: d690cb8ae14bd ("block: add an API to atomically update queue limits")
Signed-off-by: John Garry <john.g.garry@...cle.com>
---
 block/blk-settings.c   | 1 -
 include/linux/blkdev.h | 1 -
 2 files changed, 2 deletions(-)

diff --git a/block/blk-settings.c b/block/blk-settings.c
index effeb9a639bb..cdc7845260b9 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -254,7 +254,6 @@ int blk_set_default_limits(struct queue_limits *lim)
  */
 int queue_limits_commit_update(struct request_queue *q,
 		struct queue_limits *lim)
-	__releases(q->limits_lock)
 {
 	int error = blk_validate_limits(lim);
 
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 24c36929920b..f798c9c6eb30 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -904,7 +904,6 @@ static inline unsigned int blk_chunk_sectors_left(sector_t offset,
  */
 static inline struct queue_limits
 queue_limits_start_update(struct request_queue *q)
-	__acquires(q->limits_lock)
 {
 	mutex_lock(&q->limits_lock);
 	return q->limits;
-- 
2.31.1