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| author | Namhyung Kim <namhyung@gmail.com> | 2010-10-27 15:34:06 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-10-27 18:03:12 -0700 |
| commit | b8ed374e202e23caaf9bd77dcadc9de6447faaa8 (patch) | |
| tree | ea97fe186c7e0c0ee8cd61e0fc94dc42f635fd3b | |
| parent | 5ef45079dd9c8f2e9c7aa788dc3121835ae52863 (diff) | |
| download | blackbird-op-linux-b8ed374e202e23caaf9bd77dcadc9de6447faaa8.tar.gz blackbird-op-linux-b8ed374e202e23caaf9bd77dcadc9de6447faaa8.zip | |
signals: annotate lock_task_sighand()
lock_task_sighand() grabs sighand->siglock in case of returning non-NULL
but unlock_task_sighand() releases it unconditionally. This leads sparse
to complain about the lock context imbalance. Rename and wrap
lock_task_sighand() using __cond_lock() macro to make sparse happy.
Suggested-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | include/linux/sched.h | 9 | ||||
| -rw-r--r-- | kernel/signal.c | 3 |
2 files changed, 10 insertions, 2 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index 393ce94e54b7..3ff5c8519abd 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -2236,9 +2236,16 @@ static inline void task_unlock(struct task_struct *p) spin_unlock(&p->alloc_lock); } -extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk, +extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk, unsigned long *flags); +#define lock_task_sighand(tsk, flags) \ +({ struct sighand_struct *__ss; \ + __cond_lock(&(tsk)->sighand->siglock, \ + (__ss = __lock_task_sighand(tsk, flags))); \ + __ss; \ +}) \ + static inline void unlock_task_sighand(struct task_struct *tsk, unsigned long *flags) { diff --git a/kernel/signal.c b/kernel/signal.c index 919562c3d6b7..e921409b85a9 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -1105,7 +1105,8 @@ int zap_other_threads(struct task_struct *p) return count; } -struct sighand_struct *lock_task_sighand(struct task_struct *tsk, unsigned long *flags) +struct sighand_struct *__lock_task_sighand(struct task_struct *tsk, + unsigned long *flags) { struct sighand_struct *sighand; |
