[PATCH] do_group_exit: don't take tasklist_lock

do_group_exit() takes tasklist_lock for zap_other_threads(), this is unneeded
now.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 0 insertions, 2 deletions

diff --git a/kernel/exit.c b/kernel/exit.c
index 44d6c6e3896d..aea23e713cf4 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -985,7 +985,6 @@ do_group_exit(int exit_code)
         else if (!thread_group_empty(current)) {
                 struct signal_struct *const sig = current->signal;
                 struct sighand_struct *const sighand = current->sighand;
-                read_lock(&tasklist_lock);
                 spin_lock_irq(&sighand->siglock);
                 if (sig->flags & SIGNAL_GROUP_EXIT)
                         /* Another thread got here before we took the lock.  */
@@ -995,7 +994,6 @@ do_group_exit(int exit_code)
                         zap_other_threads(current);
                 }
                 spin_unlock_irq(&sighand->siglock);
-                read_unlock(&tasklist_lock);
         }
 
         do_exit(exit_code);