From: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Date: Thu, 11 Mar 2010 22:04:46 +0000 (-0800)
Subject: timer: Print function name for timer callbacks modifying preemption count
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=06f71b922ce5a05352acd706564ca4ae1f2add0e;p=linux-beck.git

timer: Print function name for timer callbacks modifying preemption count

A function scheduled with a timer must not exit with a different
preempt count than it was entered. To make helping users running into
the corresponding BUG() easier also print the name of the bad function
not only its address.

[ tglx: Sanitized printk ]

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Cc: johnstul@us.ibm.com
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---

diff --git a/kernel/timer.c b/kernel/timer.c
index c61a7949387f..f82f4bfe2d88 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -1027,11 +1027,8 @@ static inline void __run_timers(struct tvec_base *base)
 				lock_map_release(&lockdep_map);
 
 				if (preempt_count != preempt_count()) {
-					printk(KERN_ERR "huh, entered %p "
-					       "with preempt_count %08x, exited"
-					       " with %08x?\n",
-					       fn, preempt_count,
-					       preempt_count());
+					printk(KERN_ERR "timer: %pF preempt leak: %08x -> %08x\n",
+					       fn, preempt_count, preempt_count());
 					BUG();
 				}
 			}