linux-kernel - [tip:timers/core] posix-timers: Unify overrun/requeue

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Date:   Mon, 5 Jun 2017 01:16:30 -0700
From:   tip-bot for Thomas Gleixner <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, tglx@...utronix.de,
        peterz@...radead.org, hpa@...or.com, john.stultz@...aro.org,
        mingo@...nel.org
Subject: [tip:timers/core] posix-timers: Unify overrun/requeue_pending
 handling

Commit-ID:  af888d677a3f4473c198b4720319dd037f398b51
Gitweb:     http://git.kernel.org/tip/af888d677a3f4473c198b4720319dd037f398b51
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Tue, 30 May 2017 23:15:42 +0200
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Sun, 4 Jun 2017 15:40:24 +0200

posix-timers: Unify overrun/requeue_pending handling

hrtimer based posix-timers and posix-cpu-timers handle the update of the
rearming and overflow related status fields differently.

Move that update to the common rearming code.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: John Stultz <john.stultz@...aro.org>
Link: http://lkml.kernel.org/r/20170530211656.484936964@linutronix.de

---
 kernel/time/posix-cpu-timers.c | 18 +++++++-----------
 kernel/time/posix-timers.c     | 15 ++++++++-------
 2 files changed, 15 insertions(+), 18 deletions(-)

diff --git a/kernel/time/posix-cpu-timers.c b/kernel/time/posix-cpu-timers.c
index a77a792..1683e50 100644
--- a/kernel/time/posix-cpu-timers.c
+++ b/kernel/time/posix-cpu-timers.c
@@ -527,6 +527,7 @@ static void cpu_timer_fire(struct k_itimer *timer)
 		 * ticking in case the signal is deliverable next time.
 		 */
 		posix_cpu_timer_schedule(timer);
+		++timer->it_requeue_pending;
 	}
 }
 
@@ -997,12 +998,12 @@ void posix_cpu_timer_schedule(struct k_itimer *timer)
 		cpu_clock_sample(timer->it_clock, p, &now);
 		bump_cpu_timer(timer, now);
 		if (unlikely(p->exit_state))
-			goto out;
+			return;
 
 		/* Protect timer list r/w in arm_timer() */
 		sighand = lock_task_sighand(p, &flags);
 		if (!sighand)
-			goto out;
+			return;
 	} else {
 		/*
 		 * Protect arm_timer() and timer sampling in case of call to
@@ -1015,11 +1016,10 @@ void posix_cpu_timer_schedule(struct k_itimer *timer)
 			 * We can't even collect a sample any more.
 			 */
 			timer->it.cpu.expires = 0;
-			goto out;
+			return;
 		} else if (unlikely(p->exit_state) && thread_group_empty(p)) {
-			unlock_task_sighand(p, &flags);
-			/* Optimizations: if the process is dying, no need to rearm */
-			goto out;
+			/* If the process is dying, no need to rearm */
+			goto unlock;
 		}
 		cpu_timer_sample_group(timer->it_clock, p, &now);
 		bump_cpu_timer(timer, now);
@@ -1031,12 +1031,8 @@ void posix_cpu_timer_schedule(struct k_itimer *timer)
 	 */
 	WARN_ON_ONCE(!irqs_disabled());
 	arm_timer(timer);
+unlock:
 	unlock_task_sighand(p, &flags);
-
-out:
-	timer->it_overrun_last = timer->it_overrun;
-	timer->it_overrun = -1;
-	++timer->it_requeue_pending;
 }
 
 /**
diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
index dee6a0d..79a00e0 100644
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -291,10 +291,6 @@ static void schedule_next_timer(struct k_itimer *timr)
 	timr->it_overrun += (unsigned int) hrtimer_forward(timer,
 						timer->base->get_time(),
 						timr->it.real.interval);
-
-	timr->it_overrun_last = timr->it_overrun;
-	timr->it_overrun = -1;
-	++timr->it_requeue_pending;
 	hrtimer_restart(timer);
 }
 
@@ -315,18 +311,23 @@ void do_schedule_next_timer(struct siginfo *info)
 	unsigned long flags;
 
 	timr = lock_timer(info->si_tid, &flags);
+	if (!timr)
+		return;
 
-	if (timr && timr->it_requeue_pending == info->si_sys_private) {
+	if (timr->it_requeue_pending == info->si_sys_private) {
 		if (timr->it_clock < 0)
 			posix_cpu_timer_schedule(timr);
 		else
 			schedule_next_timer(timr);
 
+		timr->it_overrun_last = timr->it_overrun;
+		timr->it_overrun = -1;
+		++timr->it_requeue_pending;
+
 		info->si_overrun += timr->it_overrun_last;
 	}
 
-	if (timr)
-		unlock_timer(timr, flags);
+	unlock_timer(timr, flags);
 }
 
 int posix_timer_event(struct k_itimer *timr, int si_private)