linux-kernel - [PATCH 4.14 132/146] timers: Invoke timer_start

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Date:   Mon,  1 Jan 2018 15:38:43 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Sebastian Siewior <bigeasy@...utronix.de>, rt@...utronix.de,
        Paul McKenney <paulmck@...ux.vnet.ibm.com>,
        Anna-Maria Gleixner <anna-maria@...utronix.de>
Subject: [PATCH 4.14 132/146] timers: Invoke timer_start_debug() where it makes sense

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Thomas Gleixner <tglx@...utronix.de>

commit fd45bb77ad682be728d1002431d77b8c73342836 upstream.

The timer start debug function is called before the proper timer base is
set. As a consequence the trace data contains the stale CPU and flags
values.

Call the debug function after setting the new base and flags.

Fixes: 500462a9de65 ("timers: Switch to a non-cascading wheel")
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Sebastian Siewior <bigeasy@...utronix.de>
Cc: rt@...utronix.de
Cc: Paul McKenney <paulmck@...ux.vnet.ibm.com>
Cc: Anna-Maria Gleixner <anna-maria@...utronix.de>
Link: https://lkml.kernel.org/r/20171222145337.792907137@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 kernel/time/timer.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -982,8 +982,6 @@ __mod_timer(struct timer_list *timer, un
 	if (!ret && pending_only)
 		goto out_unlock;
 
-	debug_activate(timer, expires);
-
 	new_base = get_target_base(base, timer->flags);
 
 	if (base != new_base) {
@@ -1007,6 +1005,8 @@ __mod_timer(struct timer_list *timer, un
 		}
 	}
 
+	debug_activate(timer, expires);
+
 	timer->expires = expires;
 	/*
 	 * If 'idx' was calculated above and the base time did not advance