linux-kernel - [tip:timers/core] timer: Move trace point to get proper index

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Message-ID: <tip-dc1e7dc5ac6254ba0502323381a7ec847e408f1d@git.kernel.org>
Date:   Sun, 24 Mar 2019 13:19:44 -0700
From:   tip-bot for Anna-Maria Gleixner <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     rostedt@...dmis.org, linux-kernel@...r.kernel.org,
        tglx@...utronix.de, mingo@...nel.org, anna-maria@...utronix.de,
        hpa@...or.com
Subject: [tip:timers/core] timer: Move trace point to get proper index

Commit-ID:  dc1e7dc5ac6254ba0502323381a7ec847e408f1d
Gitweb:     https://git.kernel.org/tip/dc1e7dc5ac6254ba0502323381a7ec847e408f1d
Author:     Anna-Maria Gleixner <anna-maria@...utronix.de>
AuthorDate: Thu, 21 Mar 2019 13:09:19 +0100
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Sun, 24 Mar 2019 20:29:32 +0100

timer: Move trace point to get proper index

When placing the timer_start trace point before the timer wheel bucket
index is calculated, the index information in the trace point is useless.

It is not possible to simply move the debug_activate() call after the index
calculation, because debug_object_activate() needs to be called before
touching the object.

Therefore split debug_activate() and move the trace point into
enqueue_timer() after the new index has been calculated. The
debug_object_activate() call remains at the original place.

Signed-off-by: Anna-Maria Gleixner <anna-maria@...utronix.de>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: fweisbec@...il.com
Cc: peterz@...radead.org
Cc: Steven Rostedt <rostedt@...dmis.org>
Link: https://lkml.kernel.org/r/20190321120921.16463-3-anna-maria@linutronix.de

---
 kernel/time/timer.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index 2fce056f8a49..8d7918ae4d0c 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -536,6 +536,8 @@ static void enqueue_timer(struct timer_base *base, struct timer_list *timer,
 	hlist_add_head(&timer->entry, base->vectors + idx);
 	__set_bit(idx, base->pending_map);
 	timer_set_idx(timer, idx);
+
+	trace_timer_start(timer, timer->expires, timer->flags);
 }
 
 static void
@@ -757,13 +759,6 @@ static inline void debug_init(struct timer_list *timer)
 	trace_timer_init(timer);
 }
 
-static inline void
-debug_activate(struct timer_list *timer, unsigned long expires)
-{
-	debug_timer_activate(timer);
-	trace_timer_start(timer, expires, timer->flags);
-}
-
 static inline void debug_deactivate(struct timer_list *timer)
 {
 	debug_timer_deactivate(timer);
@@ -1037,7 +1032,7 @@ __mod_timer(struct timer_list *timer, unsigned long expires, unsigned int option
 		}
 	}
 
-	debug_activate(timer, expires);
+	debug_timer_activate(timer);
 
 	timer->expires = expires;
 	/*
@@ -1171,7 +1166,7 @@ void add_timer_on(struct timer_list *timer, int cpu)
 	}
 	forward_timer_base(base);
 
-	debug_activate(timer, timer->expires);
+	debug_timer_activate(timer);
 	internal_add_timer(base, timer);
 	raw_spin_unlock_irqrestore(&base->lock, flags);
 }