linux-kernel - [PATCH v2] dax: Add missing annotation for wait_entry

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Date:   Wed,  1 Apr 2020 16:33:59 +0100
From:   Jules Irenge <jbi.octave@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Jules Irenge <jbi.octave@...il.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org (open list:FILESYSTEM DIRECT ACCESS (DAX)),
        linux-nvdimm@...ts.01.org (open list:FILESYSTEM DIRECT ACCESS (DAX))
Subject: [PATCH v2] dax: Add missing annotation for wait_entry_unlocked()

Sparse reports a warning at wait_entry_unlocked()

warning: context imbalance in wait_entry_unlocked() - unexpected unlock

The root cause is the missing annotation at wait_entry_unlocked()
Add the missing __releases(xas->xa->xa_lock) annotation

Signed-off-by: Jules Irenge <jbi.octave@...il.com>
---
 fs/dax.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/dax.c b/fs/dax.c
index 35da144375a0..ee0468af4d81 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -244,6 +244,7 @@ static void *get_unlocked_entry(struct xa_state *xas, unsigned int order)
  * After we call xas_unlock_irq(), we cannot touch xas->xa.
  */
 static void wait_entry_unlocked(struct xa_state *xas, void *entry)
+	__releases(xas->xa->xa_lock)
 {
 	struct wait_exceptional_entry_queue ewait;
 	wait_queue_head_t *wq;
-- 
Change since v2
- gives more accurate lock variable name
2.25.1