From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756307Ab3KWPhg (ORCPT ); Sat, 23 Nov 2013 10:37:36 -0500 Received: from mail-wi0-f182.google.com ([209.85.212.182]:41759 "EHLO mail-wi0-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756203Ab3KWPh2 (ORCPT ); Sat, 23 Nov 2013 10:37:28 -0500 From: Frederic Weisbecker To: Thomas Gleixner , Ingo Molnar Cc: LKML , Frederic Weisbecker , Peter Zijlstra , Oleg Nesterov , Kosaki Motohiro , Andrew Morton Subject: [PATCH 03/10] posix-timers: Cleanup reaped target handling Date: Sat, 23 Nov 2013 16:37:13 +0100 Message-Id: <1385221040-24731-4-git-send-email-fweisbec@gmail.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1385221040-24731-1-git-send-email-fweisbec@gmail.com> References: <1385221040-24731-1-git-send-email-fweisbec@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When a timer's target is seen to be buried, for example on calls to timer_gettime(), the posix cpu timers code behaves a bit like a garbage collector and releases early the reference to the task. Then again, this optimization complicates the code for no much value: it's up to the user to release the timer and its associated ressources by calling timer_delete() after it buries the target tasks. Remove this to simplify the code. Signed-off-by: Frederic Weisbecker Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Peter Zijlstra Cc: Oleg Nesterov Cc: Kosaki Motohiro Cc: Andrew Morton --- kernel/posix-cpu-timers.c | 6 ------ 1 file changed, 6 deletions(-) diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c index dd75dc4..f509f53 100644 --- a/kernel/posix-cpu-timers.c +++ b/kernel/posix-cpu-timers.c @@ -638,8 +638,6 @@ static int posix_cpu_timer_set(struct k_itimer *timer, int flags, */ if (unlikely(p->sighand == NULL)) { read_unlock(&tasklist_lock); - put_task_struct(p); - timer->it.cpu.task = NULL; return -ESRCH; } @@ -807,8 +805,6 @@ static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp) * We can't even collect a sample any more. * Call the timer disarmed, nothing else to do. */ - put_task_struct(p); - timer->it.cpu.task = NULL; timer->it.cpu.expires = 0; read_unlock(&tasklist_lock); goto dead; @@ -1058,8 +1054,6 @@ void posix_cpu_timer_schedule(struct k_itimer *timer) * The process has been reaped. * We can't even collect a sample any more. */ - put_task_struct(p); - timer->it.cpu.task = p = NULL; timer->it.cpu.expires = 0; goto out_unlock; } else if (unlikely(p->exit_state) && thread_group_empty(p)) { -- 1.8.3.1