linux-kernel - Re: [PATCH -mm] signals-clear-signal-tty-when-the-last-thread-exits.fix

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Date:	Wed, 24 Mar 2010 17:42:55 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Alan Cox <alan@...ux.intel.com>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Roland McGrath <roland@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm]
	signals-clear-signal-tty-when-the-last-thread-exits.fix

I didn't get this warning, but the old gcc complains

	kernel/exit.c: In function 'release_task':
	kernel/exit.c:85: warning: 'tty' may be used uninitialized in this function

This clearly wrong, to the point it blames release_task() instead of
__exit_signal(). But let's make compiler happy anyway.

Thanks Andrew, now I know we have the handy uninitialized_var() helper ;)

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

 kernel/exit.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 34-rc1/kernel/exit.c~FIX_EXIT_SIGNAL_TTY_WARNING	2010-03-21 18:36:44.000000000 +0100
+++ 34-rc1/kernel/exit.c	2010-03-24 17:36:32.000000000 +0100
@@ -82,7 +82,7 @@ static void __exit_signal(struct task_st
 	struct signal_struct *sig = tsk->signal;
 	bool group_dead = thread_group_leader(tsk);
 	struct sighand_struct *sighand;
-	struct tty_struct *tty;
+	struct tty_struct *uninitialized_var(tty);
 
 	BUG_ON(!sig);
 	BUG_ON(!atomic_read(&sig->count));

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