diff options
| author | Namhyung Kim <namhyung@gmail.com> | 2010-10-26 14:22:00 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-10-26 16:52:09 -0700 |
| commit | 1b36ba815bd91f17e31277a44dd5c6b6a5a8d97e (patch) | |
| tree | 9d68d66e780c619b01c5d8ddc93e19547b448142 | |
| parent | e6219ec8195efd5640765e657810f262ad9d1a92 (diff) | |
| download | lwn-1b36ba815bd91f17e31277a44dd5c6b6a5a8d97e.tar.gz lwn-1b36ba815bd91f17e31277a44dd5c6b6a5a8d97e.zip | |
mm: wrap follow_pte() using __cond_lock()
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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/memory.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/mm/memory.c b/mm/memory.c index 01bdf9dbbfac..861f7982dd54 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3351,7 +3351,7 @@ 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; @@ -3388,6 +3388,17 @@ 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 |