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Subject[PATCH v2] dax: Add missing annotations for dax_read_lock() and dax_read_unlock()
Sparse reports warnings at dax_read_lock() and dax_read_unlock()

warning: context imbalance in dax_read_lock() - wrong count at exit
warning: context imbalance in dax_read_unlock() - unexpected unlock

The root cause is the missing annotations at dax_read_lock()
and dax_read_unlock()

Add the missing __acquires(&dax_srcu) annotation to dax_read_lock()
Add the missing __releases(&dax_srcu) annotation to dax_read_unlock()

Signed-off-by: Jules Irenge <>
Changes since V1
Correct commit log typing mistakes

drivers/dax/super.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/dax/super.c b/drivers/dax/super.c
index 26a654dbc69a..f872a2fb98d4 100644
--- a/drivers/dax/super.c
+++ b/drivers/dax/super.c
@@ -28,13 +28,13 @@ static struct super_block *dax_superblock __read_mostly;
static struct hlist_head dax_host_list[DAX_HASH_SIZE];
static DEFINE_SPINLOCK(dax_host_lock);

-int dax_read_lock(void)
+int dax_read_lock(void) __acquires(&dax_srcu)
return srcu_read_lock(&dax_srcu);

-void dax_read_unlock(int id)
+void dax_read_unlock(int id) __releases(&dax_srcu)
srcu_read_unlock(&dax_srcu, id);
 \ /
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