* Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> > > (No, introducing WARN_ON()s is not fine; it spams kerneloops.org at
> > > least...)
> >
> > The warning is still here on 2.6.29-rc1. It taints the kernel.
>
> Does this fix it?
i've applied it to tip/timers/urgent and will send it to Linus if it
passes Alexander's testing too. Below is the prettified commit.
Thanks guys,
Ingo
-------------->
>From b1f1006971b6f8d330c6e8ecf240f51c9eb67f4d Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Mon, 12 Jan 2009 12:52:23 +0100
Subject: [PATCH] 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 26afe5f2fbf06ea0765aaa316640c4dd472310c0
> (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@xxxxxxxxx>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
arch/x86/kernel/hpet.c | 2 +-
include/linux/workqueue.h | 6 ++++++
2 files changed, 7 insertions(+), 1 deletions(-)
diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c
index cd759ad..bb2e0f0 100644
--- a/arch/x86/kernel/hpet.c
+++ b/arch/x86/kernel/hpet.c
@@ -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);
diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
index b362911..47151c8 100644
--- a/include/linux/workqueue.h
+++ b/include/linux/workqueue.h
@@ -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)); \
--
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