[PATCH -mm 1/3] call_usermodehelper: no need to unblock the signals

[Oleg Nesterov <oleg@redhat.com>]

____call_usermodehelper() correctly calls flush_signal_handlers()
to set SIG_DFL, but sigemptyset(->blocked) and recalc_sigpending()
are not needed.

This kthread was forked by workqueue thread, all signals must be
unblocked and ignored, no pending signal is possible.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
---

 kernel/kmod.c |    3 ---
 1 file changed, 3 deletions(-)

--- mm/kernel/kmod.c~1_SIGNALS	2010-02-26 22:07:38.000000000 +0100
+++ mm/kernel/kmod.c	2010-03-09 21:31:09.000000000 +0100
@@ -153,11 +153,8 @@ static int ____call_usermodehelper(void 
 	struct subprocess_info *sub_info = data;
 	int retval;
 
-	/* Unblock all signals */
 	spin_lock_irq(&current->sighand->siglock);
 	flush_signal_handlers(current, 1);
-	sigemptyset(&current->blocked);
-	recalc_sigpending();
 	spin_unlock_irq(&current->sighand->siglock);
 
 	/* We can run anywhere, unlike our parent keventd(). */