From: Namhyung Kim <namhyung@gmail.com>
To: Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org
Subject: [PATCH 05/12] mm: wrap follow_pte() using __cond_lock()
Date: Thu, 30 Sep 2010 12:50:14 +0900 [thread overview]
Message-ID: <1285818621-29890-6-git-send-email-namhyung@gmail.com> (raw)
In-Reply-To: <1285818621-29890-1-git-send-email-namhyung@gmail.com>
The follow_pte() conditionally grabs *@ptlp in case of returning 0.
Rename and wrap it using __cond_lock() removes following warnings:
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>
---
mm/memory.c | 13 ++++++++++++-
1 files changed, 12 insertions(+), 1 deletions(-)
diff --git a/mm/memory.c b/mm/memory.c
index 76fa60e..6892fe8 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3344,7 +3344,7 @@ int in_gate_area_no_task(unsigned long addr)
#endif /* __HAVE_ARCH_GATE_AREA */
-static int follow_pte(struct mm_struct *mm, unsigned long address,
+static int __follow_pte(struct mm_struct *mm, unsigned long address,
pte_t **ptepp, spinlock_t **ptlp)
{
pgd_t *pgd;
@@ -3381,6 +3381,17 @@ out:
return -EINVAL;
}
+static inline int follow_pte(struct mm_struct *mm, unsigned long address,
+ pte_t **ptepp, spinlock_t **ptlp)
+{
+ int res;
+
+ /* (void) is needed to make gcc happy */
+ (void) __cond_lock(*ptlp,
+ !(res = __follow_pte(mm, address, ptepp, ptlp)));
+ return res;
+}
+
/**
* follow_pfn - look up PFN at a user virtual address
* @vma: memory mapping
--
1.7.2.2
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next prev parent reply other threads:[~2010-09-30 3:50 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-30 3:50 [PATCH 00/12] mm: fix sparse warnings Namhyung Kim
2010-09-30 3:50 ` [PATCH 01/12] mm: remove temporary variable on generic_file_direct_write() Namhyung Kim
2010-09-30 3:50 ` [PATCH 02/12] mm: add casts to/from gfp_t in gfp_to_alloc_flags() Namhyung Kim
2010-09-30 3:50 ` [PATCH 03/12] mm: wrap get_locked_pte() using __cond_lock() Namhyung Kim
2010-09-30 3:50 ` [PATCH 04/12] mm: add lock release annotation on do_wp_page() Namhyung Kim
2010-09-30 3:50 ` Namhyung Kim [this message]
2010-09-30 3:50 ` [PATCH 06/12] rmap: annotate lock context change on page_[un]lock_anon_vma() Namhyung Kim
2010-09-30 3:50 ` [PATCH 07/12] rmap: wrap page_check_address() using __cond_lock() Namhyung Kim
2010-09-30 3:50 ` [PATCH 08/12] rmap: make anon_vma_[chain_]free() static Namhyung Kim
2010-09-30 3:50 ` [PATCH 09/12] vmalloc: rename temporary variable in __insert_vmap_area() Namhyung Kim
2010-09-30 3:50 ` [PATCH 10/12] vmalloc: annotate lock context change on s_start/stop() Namhyung Kim
2010-09-30 3:50 ` [PATCH 11/12] mm: declare some external symbols Namhyung Kim
2010-09-30 3:50 ` [PATCH 12/12] vmstat: include compaction.h when CONFIG_COMPACTION Namhyung Kim
2010-10-05 21:27 ` Andrew Morton
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