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

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Message-Id: <20090413114932.44b47910.akpm@linux-foundation.org>
Date:	Mon, 13 Apr 2009 11:49:32 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	mingo@...e.hu, Valdis.Kletnieks@...edu, travis@....com,
	linux-kernel@...r.kernel.org, mm-commits@...r.kernel.org,
	rusty@...tcorp.com.au, davej@...hat.com, lenb@...nel.org
Subject: Re: mmotm 2009-04-10-02-21 uploaded - forkbombed by work_for_cpu

On Mon, 13 Apr 2009 10:45:45 -0700 (PDT)
Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> 
> 
> On Mon, 13 Apr 2009, Andrew Morton wrote:
> >
> >  static void drv_write(struct drv_cmd *cmd)
> >  {
> > -	unsigned int i;
> > +	unsigned int cpu;
> >  
> > -	for_each_cpu(i, cmd->mask) {
> > -		work_on_cpu(i, do_drv_write, cmd);
> > -	}
> > +	for_each_cpu(cpu, cmd->mask)
> > +		smp_call_function_single(cpu, do_drv_write, cmd, 1);
> 
> Ok, that's just -wrong-.
> 
> Doesn't anybody else see anything odd in doing
> 
> 	for_each_cpu(cpu, cmd->mask)
> 		smp_call_function_single(cpu, ..);
> 
> and react to it?
> 
> IOW, why not just do
> 
> 	smp_call_function_many(cmd->mask, do_drv_write, cmd, 1);
> 
> here?
> 

Didn't know it existed :(
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