linux-kernel - Re: [PATCH 1/2] perf, cpu hotplug: Run CPU

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Message-ID: <506EB9D6.2070000@linux.vnet.ibm.com>
Date:	Fri, 05 Oct 2012 16:13:34 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	a.p.zijlstra@...llo.nl, mingo@...nel.org
CC:	acme@...radead.org, paulus@...ba.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] perf, cpu hotplug: Run CPU_STARTING notifiers with
 irqs disabled

On 09/13/2012 08:12 PM, Srivatsa S. Bhat wrote:
> The CPU_STARTING notifiers are supposed to be run with irqs disabled. But the
> perf_cpu_notifier() macro invokes them without doing that. Fix it.
> 
> Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
> ---

Any thoughts on this?

Regards,
Srivatsa S. Bhat

> 
>  include/linux/perf_event.h |    3 +++
>  1 files changed, 3 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
> index 7602ccb..cc4574d 100644
> --- a/include/linux/perf_event.h
> +++ b/include/linux/perf_event.h
> @@ -1346,10 +1346,13 @@ static inline void perf_event_task_tick(void)				{ }
>  do {									\
>  	static struct notifier_block fn##_nb __cpuinitdata =		\
>  		{ .notifier_call = fn, .priority = CPU_PRI_PERF };	\
> +	unsigned long flags;						\
>  	fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE,			\
>  		(void *)(unsigned long)smp_processor_id());		\
> +	local_irq_save(flags);						\
>  	fn(&fn##_nb, (unsigned long)CPU_STARTING,			\
>  		(void *)(unsigned long)smp_processor_id());		\
> +	local_irq_restore(flags);					\
>  	fn(&fn##_nb, (unsigned long)CPU_ONLINE,				\
>  		(void *)(unsigned long)smp_processor_id());		\
>  	register_cpu_notifier(&fn##_nb);				\
> 

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