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@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/memory.c b/mm/memory.c
index 4ce24a4d5d481abce591576b218b901dde134c83..01bdf9dbbfac774380b2d25336c52b5822359b08 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2108,6 +2108,7 @@ 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;