linux-kernel - Re: mmotm 2009-04-10-02-21 uploaded

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Message-ID: <20090415090826.GA2808@lilem.mirepesht>
Date:	Wed, 15 Apr 2009 13:38:26 +0430
From:	Ali Gholami Rudi <ali@...i.ir>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Valdis.Kletnieks@...edu, Mike Travis <travis@....com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	mm-commits@...r.kernel.org, Rusty Russell <rusty@...tcorp.com.au>,
	Dave Jones <davej@...hat.com>, Len Brown <lenb@...nel.org>
Subject: Re: mmotm 2009-04-10-02-21 uploaded - forkbombed by work_for_cpu

Andrew Morton <akpm@...ux-foundation.org> wrote:
> >       [ Made it use smp_call_function_many() instead of looping over cpu's
> >         with smp_call_function_single()    - Linus ]
> 
> <stares suspiciously at smp_call_function_many()>
> 
>  * smp_call_function_many(): Run a function on a set of other CPUs.
> 
> "other".  It refuses to call the function on *this* CPU.  Tricky.
> 
> Does this fix it up?
> 
> --- a/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c~a
> +++ a/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c
> @@ -204,7 +204,10 @@ static void drv_read(struct drv_cmd *cmd
>  
>  static void drv_write(struct drv_cmd *cmd)
>  {
> -	smp_call_function_many(cmd->mask, do_drv_write, cmd, 1);
> +	unsigned cpu;
> +
> +	for_each_cpu(cpu, cmd->mask)
> +		smp_call_function_single(cpu, do_drv_write, cmd, 1);	
>  }
>  
>  static u32 get_cur_val(const struct cpumask *mask)
> _

Yes, it does fix it.

Thanks,
Ali
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