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authorOleg Nesterov <oleg@tv-sign.ru>2008-07-25 01:47:29 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-25 10:53:38 -0700
commit3854a771821c970065e3203a0b40ddc4101538cc (patch)
treeb6f56b8d426c4a9682dfc8605a08a5c60f96a599
parent100360f03077663b7bef3af44805b6cf700c3bee (diff)
__exit_signal: don't take rcu lock
There is no reason for rcu_read_lock() in __exit_signal(). tsk->sighand can only be changed if tsk does exec, obviously this is not possible. 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--kernel/exit.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/kernel/exit.c b/kernel/exit.c
index 93d2711b938..a7799d8a640 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -85,7 +85,6 @@ static void __exit_signal(struct task_struct *tsk)
BUG_ON(!sig);
BUG_ON(!atomic_read(&sig->count));
- rcu_read_lock();
sighand = rcu_dereference(tsk->sighand);
spin_lock(&sighand->siglock);
@@ -136,7 +135,6 @@ static void __exit_signal(struct task_struct *tsk)
tsk->signal = NULL;
tsk->sighand = NULL;
spin_unlock(&sighand->siglock);
- rcu_read_unlock();
__cleanup_sighand(sighand);
clear_tsk_thread_flag(tsk,TIF_SIGPENDING);