linux-kernel - [PATCH 04/12] mm: add lock release annotation on do_wp

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Message-Id: <1285818621-29890-5-git-send-email-namhyung@gmail.com>
Date:	Thu, 30 Sep 2010 12:50:13 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH 04/12] mm: add lock release annotation on do_wp_page()

The do_wp_page() releases @ptl but was missing proper annotation.
Add it. This removes following warnings from sparse:

 mm/memory.c:2337:9: warning: context imbalance in 'do_wp_page' - unexpected unlock
 mm/memory.c:3142:19: warning: context imbalance in 'handle_mm_fault' - different lock contexts for basic block

Signed-off-by: Namhyung Kim <namhyung@...il.com>
---
 mm/memory.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index 219b50a..76fa60e 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2107,6 +2107,7 @@ static inline void cow_user_page(struct page *dst, struct page *src, unsigned lo
 static int do_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
 		unsigned long address, pte_t *page_table, pmd_t *pmd,
 		spinlock_t *ptl, pte_t orig_pte)
+	__releases(ptl)
 {
 	struct page *old_page, *new_page;
 	pte_t entry;
-- 
1.7.2.2

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