Subject: Re: [PATCH] powerpc: stop_this_cpu: remove the cpu from the online map.

From: Valentine <[email-masked]>
Date: Tue, 08 Dec 2009 00:58:00 +0300

Ben, is this OK?
Other architectures do the same thing.

Thanks,
Val.

Valentine Barshak wrote:
> Remove the CPU from the online map to prevent smp_call_function
> from sending messages to a stopped CPU.
> 
> Signed-off-by: Valentine Barshak <[email-masked]>
> ---
>  arch/powerpc/kernel/smp.c |    3 +++
>  1 file changed, 3 insertions(+)
> 
> diff -pruN linux-2.6.orig/arch/powerpc/kernel/smp.c linux-2.6/arch/powerpc/kernel/smp.c
> --- linux-2.6.orig/arch/powerpc/kernel/smp.c	2009-11-26 00:22:15.000000000 +0300
> +++ linux-2.6/arch/powerpc/kernel/smp.c	2009-11-26 00:26:48.000000000 +0300
> @@ -218,6 +218,9 @@ void crash_send_ipi(void (*crash_ipi_cal
>  
>  static void stop_this_cpu(void *dummy)
>  {
> +	/* Remove this CPU */
> +	set_cpu_online(smp_processor_id(), false);
> +
>  	local_irq_disable();
>  	while (1)
>  		;
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