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Commit 06f71b92 authored by Uwe Kleine-König's avatar Uwe Kleine-König Committed by Thomas Gleixner
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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: default avatarUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Cc: johnstul@us.ibm.com
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 64ce4c2f

kernel/timer.c

+2 −5
Original line number Diff line number Diff line
@@ -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();

				}

			}