linux-kernel - [PATCH 03/12] mm: wrap get_locked_pte() using __cond

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Date:	Thu, 30 Sep 2010 12:50:12 +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 03/12] mm: wrap get_locked_pte() using __cond_lock()

The get_locked_pte() conditionally grabs 'ptl' in case of returning
non-NULL. This leads sparse to complain about context imbalance.
Rename and wrap it using __cond_lock() to make sparse happy.

Signed-off-by: Namhyung Kim <namhyung@...il.com>
---
 include/linux/mm.h |   10 +++++++++-
 mm/memory.c        |    2 +-
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 74949fb..e48616d 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1023,7 +1023,15 @@ extern void unregister_shrinker(struct shrinker *);
 
 int vma_wants_writenotify(struct vm_area_struct *vma);
 
-extern pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr, spinlock_t **ptl);
+extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr,
+			       spinlock_t **ptl);
+static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr,
+				    spinlock_t **ptl)
+{
+	pte_t *ptep;
+	__cond_lock(*ptl, ptep = __get_locked_pte(mm, addr, ptl));
+	return ptep;
+}
 
 #ifdef __PAGETABLE_PUD_FOLDED
 static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd,
diff --git a/mm/memory.c b/mm/memory.c
index 0e18b4d..219b50a 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1590,7 +1590,7 @@ struct page *get_dump_page(unsigned long addr)
 }
 #endif /* CONFIG_ELF_CORE */
 
-pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr,
+pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr,
 			spinlock_t **ptl)
 {
 	pgd_t * pgd = pgd_offset(mm, addr);
-- 
1.7.2.2

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