linux-kernel - [PATCH RT 2/7] timer: Invoke timer_start

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Date:   Wed,  4 Apr 2018 09:16:47 +0200
From:   Daniel Wagner <wagi@...om.org>
To:     linux-kernel@...r.kernel.org
Cc:     linux-rt-users <linux-rt-users@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Carsten Emde <C.Emde@...dl.org>,
        John Kacur <jkacur@...hat.com>,
        Paul Gortmaker <paul.gortmaker@...driver.com>,
        Julia Cartwright <julia@...com>,
        Daniel Wagner <daniel.wagner@...mens.com>,
        tom.zanussi@...ux.intel.com, stable@...r.kernel.org,
        rt@...utronix.de, Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [PATCH RT 2/7] timer: Invoke timer_start_debug() where it makes sense

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

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: stable@...r.kernel.org
Cc: rt@...utronix.de
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
 kernel/time/timer.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index a8246d79cb5a..6b322aea1c46 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -838,8 +838,6 @@ __mod_timer(struct timer_list *timer, unsigned long expires,
 	if (!ret && pending_only)
 		goto out_unlock;
 
-	debug_activate(timer, expires);
-
 	new_base = get_target_base(base, pinned);
 
 	if (base != new_base) {
@@ -854,6 +852,8 @@ __mod_timer(struct timer_list *timer, unsigned long expires,
 			base = switch_timer_base(timer, base, new_base);
 	}
 
+	debug_activate(timer, expires);
+
 	timer->expires = expires;
 	internal_add_timer(base, timer);
 
-- 
2.14.3