linux-kernel - [PATCH v2] dax: Add missing annotations for dax_read_lock() and dax_read

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Message-Id: <20200224015049.57556-1-jbi.octave@gmail.com>
Date:   Mon, 24 Feb 2020 01:50:49 +0000
From:   Jules Irenge <jbi.octave@...il.com>
To:     boqun.feng@...il.com
Cc:     dan.j.williams@...el.com, vishal.l.verma@...el.co,
        dave.jiang@...el.com, linux-nvdimm@...ts.01.org,
        linux-kernel@...r.kernel.org, yi.zhang@...hat.com,
        Jules Irenge <jbi.octave@...il.com>
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 <jbi.octave@...il.com>
---
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);
 }
 EXPORT_SYMBOL_GPL(dax_read_lock);
 
-void dax_read_unlock(int id)
+void dax_read_unlock(int id) __releases(&dax_srcu)
 {
 	srcu_read_unlock(&dax_srcu, id);
 }
-- 
2.24.1