[PATCH v4 09/12] block/blk-mq-debugfs: Improve lock context annotations

[Bart Van Assche <bvanassche@acm.org>]

Make the existing lock context annotations compatible with Clang. Add
the lock context annotations that are missing.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
 block/blk-mq-debugfs.c | 12 ++++++------
 block/blk.h            |  4 ++++
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index 047ec887456b..5c168e82273e 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -20,7 +20,7 @@ static int queue_poll_stat_show(void *data, struct seq_file *m)
 }
 
 static void *queue_requeue_list_start(struct seq_file *m, loff_t *pos)
-	__acquires(&q->requeue_lock)
+	__acquires(&((struct request_queue *)m->private)->requeue_lock)
 {
 	struct request_queue *q = m->private;
 
@@ -36,7 +36,7 @@ static void *queue_requeue_list_next(struct seq_file *m, void *v, loff_t *pos)
 }
 
 static void queue_requeue_list_stop(struct seq_file *m, void *v)
-	__releases(&q->requeue_lock)
+	__releases(&((struct request_queue *)m->private)->requeue_lock)
 {
 	struct request_queue *q = m->private;
 
@@ -298,7 +298,7 @@ int blk_mq_debugfs_rq_show(struct seq_file *m, void *v)
 EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show);
 
 static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos)
-	__acquires(&hctx->lock)
+	__acquires(&((struct blk_mq_hw_ctx *)m->private)->lock)
 {
 	struct blk_mq_hw_ctx *hctx = m->private;
 
@@ -314,7 +314,7 @@ static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos)
 }
 
 static void hctx_dispatch_stop(struct seq_file *m, void *v)
-	__releases(&hctx->lock)
+	__releases(&((struct blk_mq_hw_ctx *)m->private)->lock)
 {
 	struct blk_mq_hw_ctx *hctx = m->private;
 
@@ -486,7 +486,7 @@ static int hctx_dispatch_busy_show(void *data, struct seq_file *m)
 
 #define CTX_RQ_SEQ_OPS(name, type)					\
 static void *ctx_##name##_rq_list_start(struct seq_file *m, loff_t *pos) \
-	__acquires(&ctx->lock)						\
+	__acquires(&((struct blk_mq_ctx *)m->private)->lock)		\
 {									\
 	struct blk_mq_ctx *ctx = m->private;				\
 									\
@@ -503,7 +503,7 @@ static void *ctx_##name##_rq_list_next(struct seq_file *m, void *v,	\
 }									\
 									\
 static void ctx_##name##_rq_list_stop(struct seq_file *m, void *v)	\
-	__releases(&ctx->lock)						\
+	__releases(&((struct blk_mq_ctx *)m->private)->lock)		\
 {									\
 	struct blk_mq_ctx *ctx = m->private;				\
 									\
diff --git a/block/blk.h b/block/blk.h
index b998a7761faf..70b794e89a67 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -754,16 +754,19 @@ static inline void blk_unfreeze_release_lock(struct request_queue *q)
  * reclaim from triggering block I/O.
  */
 static inline void blk_debugfs_lock_nomemsave(struct request_queue *q)
+	__acquires(&q->debugfs_mutex)
 {
 	mutex_lock(&q->debugfs_mutex);
 }
 
 static inline void blk_debugfs_unlock_nomemrestore(struct request_queue *q)
+	__releases(&q->debugfs_mutex)
 {
 	mutex_unlock(&q->debugfs_mutex);
 }
 
 static inline unsigned int __must_check blk_debugfs_lock(struct request_queue *q)
+	__acquires(&q->debugfs_mutex)
 {
 	unsigned int memflags = memalloc_noio_save();
 
@@ -773,6 +776,7 @@ static inline unsigned int __must_check blk_debugfs_lock(struct request_queue *q
 
 static inline void blk_debugfs_unlock(struct request_queue *q,
 				      unsigned int memflags)
+	__releases(&q->debugfs_mutex)
 {
 	blk_debugfs_unlock_nomemrestore(q);
 	memalloc_noio_restore(memflags);