Commit 6d612b0f authored Jan 12, 2009 by Peter Zijlstra Committed by Ingo Molnar Jan 12, 2009

locking, hpet: annotate false positive warning



Alexander Beregalov reported that this warning is caused by the HPET code:

> hpet0: at MMIO 0xfed00000, IRQs 2, 8, 0
> hpet0: 3 comparators, 64-bit 14.318180 MHz counter
> ODEBUG: object is on stack, but not annotated
> ------------[ cut here ]------------
> WARNING: at lib/debugobjects.c:251 __debug_object_init+0x2a4/0x352()

> Bisected down to 26afe5f2
> (x86: HPET_MSI Initialise per-cpu HPET timers)

The commit is fine - but the on-stack workqueue entry needs annotation.

Reported-and-bisected-by: Alexander Beregalov <a.beregalov@gmail.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Tested-by: Alexander Beregalov <a.beregalov@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

parent 783adf42

arch/x86/kernel/hpet.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -628,7 +628,7 @@ static int hpet_cpuhp_notify(struct notifier_block *n,

		switch (action & 0xf) {
		case CPU_ONLINE:
		INIT_DELAYED_WORK(&work.work, hpet_work);
		INIT_DELAYED_WORK_ON_STACK(&work.work, hpet_work);
		init_completion(&work.complete);
		/* FIXME: add schedule_work_on() */
		schedule_delayed_work_on(cpu, &work.work, 0);

include/linux/workqueue.h

+6 −0

Original line number	Diff line number	Diff line
		@@ -118,6 +118,12 @@ struct execute_work {
		init_timer(&(_work)->timer); \
		} while (0)

		#define INIT_DELAYED_WORK_ON_STACK(_work, _func) \
		do { \
		INIT_WORK(&(_work)->work, (_func)); \
		init_timer_on_stack(&(_work)->timer); \
		} while (0)

		#define INIT_DELAYED_WORK_DEFERRABLE(_work, _func) \
		do { \
		INIT_WORK(&(_work)->work, (_func)); \