linux-kernel - Re: [PATCH] ACPICA: don't cond_resched() when irq_disabled or in

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Date:	Thu, 3 Dec 2009 22:50:58 -0800
From:	Justin Mattock <justinmattock@...il.com>
To:	Xiaotian Feng <dfeng@...hat.com>
Cc:	lenb@...nel.org, ming.m.lin@...el.com, robert.moore@...el.com,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ACPICA: don't cond_resched() when irq_disabled or 
	in_atomic

On Thu, Dec 3, 2009 at 8:26 PM, Xiaotian Feng <dfeng@...hat.com> wrote:
> commit 8bd108d adds preemption point after each opcode parse, then
> a sleeping function called from invalid context bug was founded
> during suspend/resume stage. this was fixed in commit abe1dfa by
> don't cond_resched when irq_disabled. But recent commit 138d156 changes
> the behaviour to don't cond_resched when in_atomic. This makes the
> sleeping function called from invalid context bug happen again, which
> is reported in http://lkml.org/lkml/2009/12/1/371.
>
> The fix is to cond_sched() only when preemptible, which means not in
> irq_disabled or in_atomic.
>
> Reported-and-bisected-by: Larry Finger <Larry.Finger@...inger.net>
> Signed-off-by: Xiaotian Feng <dfeng@...hat.com>
> ---
>  include/acpi/platform/aclinux.h |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/include/acpi/platform/aclinux.h b/include/acpi/platform/aclinux.h
> index 9d7febd..5b415ee 100644
> --- a/include/acpi/platform/aclinux.h
> +++ b/include/acpi/platform/aclinux.h
> @@ -152,7 +152,7 @@ static inline void *acpi_os_acquire_object(acpi_cache_t * cache)
>  #include <linux/hardirq.h>
>  #define ACPI_PREEMPTION_POINT() \
>        do { \
> -               if (!in_atomic_preempt_off()) \
> +               if (preemptible()) \
>                        cond_resched(); \
>        } while (0)
>
> --
> 1.6.5.2
>
> --
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>

looks good
kernel compiled without any issues,
echo mem > /sys/power/state
reported no warning message.

Also if you don't mind add:
Reported-and-bisected-by: Justin P. Mattock <justinmattock@...il.com>

Id like to get some kind of credit for this b*tch.

-- 
Justin P. Mattock
--
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