diff options
| author | Oleg Nesterov <oleg@tv-sign.ru> | 2008-04-30 09:53:04 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-30 17:29:37 +0200 |
| commit | 7a5e873f096e04e6d8719e4ecb7b70d2decca503 (patch) | |
| tree | 2d3f7cc6c15e03de02484f9d754a9174ce2fff76 | |
| parent | signals: fix /sbin/init protection from unwanted signals (diff) | |
| download | linux-7a5e873f096e04e6d8719e4ecb7b70d2decca503.tar.xz linux-7a5e873f096e04e6d8719e4ecb7b70d2decca503.zip | |
signals: de_thread: simplify the ->child_reaper switching
Now that we rely on SIGNAL_UNKILLABLE flag, de_thread() doesn't need the nasty
hack to kill the old ->child_reaper during the mt-exec.
This also means we can avoid taking tasklist_lock around zap_other_threads().
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
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-- | fs/exec.c | 15 |
1 files changed, 2 insertions, 13 deletions
diff --git a/fs/exec.c b/fs/exec.c index a13883903ee9..8fccc276d40d 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -766,9 +766,7 @@ static int de_thread(struct task_struct *tsk) /* * Kill all other threads in the thread group. - * We must hold tasklist_lock to call zap_other_threads. */ - read_lock(&tasklist_lock); spin_lock_irq(lock); if (signal_group_exit(sig)) { /* @@ -776,21 +774,10 @@ static int de_thread(struct task_struct *tsk) * return so that the signal is processed. */ spin_unlock_irq(lock); - read_unlock(&tasklist_lock); return -EAGAIN; } - - /* - * child_reaper ignores SIGKILL, change it now. - * Reparenting needs write_lock on tasklist_lock, - * so it is safe to do it under read_lock. - */ - if (unlikely(tsk->group_leader == task_child_reaper(tsk))) - task_active_pid_ns(tsk)->child_reaper = tsk; - sig->group_exit_task = tsk; zap_other_threads(tsk); - read_unlock(&tasklist_lock); /* Account for the thread group leader hanging around: */ count = thread_group_leader(tsk) ? 1 : 2; @@ -821,6 +808,8 @@ static int de_thread(struct task_struct *tsk) schedule(); } + if (unlikely(task_child_reaper(tsk) == leader)) + task_active_pid_ns(tsk)->child_reaper = tsk; /* * The only record we have of the real-time age of a * process, regardless of execs it's done, is start_time. |