linux-kernel - Re: [Linux 2.6.28-rc4] BUG: using smp_processor_id() in preemptible [00000000] code: suspend_to

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Message-ID: <8db1092f0811121234p3be15e29n5fd684e387977dab@mail.gmail.com>
Date:	Wed, 12 Nov 2008 21:34:54 +0100
From:	"Maciej Rutecki" <maciej.rutecki@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"lenb@...nel.org" <lenb@...nel.org>, linux-acpi@...r.kernel.org
Subject: Re: [Linux 2.6.28-rc4] BUG: using smp_processor_id() in preemptible [00000000] code: suspend_to_disk/2934

2008/11/12 Ingo Molnar <mingo@...e.hu>:

>
> i've queued up the fix below in tip/sched/urgent - Maciej, could you
> please test it? I've build and boot tested it.
>

Suspend to disk works OK now. Thanks.

Tested-by: Maciej Rutecki <maciej.rutecki@...il.com>
>
> Reported-by: Maciej Rutecki <maciej.rutecki@...il.com>
> Signed-off-by: Ingo Molnar <mingo@...e.hu>
> ---
>  kernel/sched.c |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
>
> diff --git a/kernel/sched.c b/kernel/sched.c
> index 3bafbe3..c94baf2 100644
> --- a/kernel/sched.c
> +++ b/kernel/sched.c
> @@ -5870,6 +5870,8 @@ void __cpuinit init_idle(struct task_struct *idle, int cpu)
>        struct rq *rq = cpu_rq(cpu);
>        unsigned long flags;
>
> +       spin_lock_irqsave(&rq->lock, flags);
> +
>        __sched_fork(idle);
>        idle->se.exec_start = sched_clock();
>
> @@ -5877,7 +5879,6 @@ void __cpuinit init_idle(struct task_struct *idle, int cpu)
>        idle->cpus_allowed = cpumask_of_cpu(cpu);
>        __set_task_cpu(idle, cpu);
>
> -       spin_lock_irqsave(&rq->lock, flags);
>        rq->curr = rq->idle = idle;
>  #if defined(CONFIG_SMP) && defined(__ARCH_WANT_UNLOCKED_CTXSW)
>        idle->oncpu = 1;
>
>

Regards
-- 
Maciej Rutecki
http://www.maciek.unixy.pl
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