linux-kernel - Re: [RFC 1/4] ARM: topology: Add arch_scale_freq

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Message-ID: <20120613192740.GZ5878@dm>
Date:	Wed, 13 Jun 2012 20:27:40 +0100
From:	Andy Whitcroft <apw@...onical.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Vincent Guittot <vincent.guittot@...aro.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linaro-dev@...ts.linaro.org, devicetree-discuss@...ts.ozlabs.org,
	linux@....linux.org.uk, grant.likely@...retlab.ca,
	rob.herring@...xeda.com
Subject: Re: [RFC 1/4] ARM: topology: Add arch_scale_freq_power function

On Wed, Jun 13, 2012 at 02:52:49PM +0200, Peter Zijlstra wrote:
> On Tue, 2012-06-12 at 14:02 +0200, Vincent Guittot wrote:
> >         }
> >         smp_wmb();
> >  } 
> 
> You know what.. we should make checkpatch report an error for memory
> barriers that don't have a comment. 
> 
> I know this isn't added by this patch, but every time I see something
> like it I cry a little.

Actually if it was a new line, it would have been reported, at least in
theory:

    # check for memory barriers without a comment.
		    if ($line =~
    /\b(mb|rmb|wmb|read_barrier_depends|smp_mb|smp_rmb|smp_wmb|smp_read_barrier_depends)\(/)
    {
	if (!ctx_has_comment($first_line, $linenr)) {
	    CHK("MEMORY_BARRIER",
		"memory barrier without comment\n" . $herecurr);
	}
    }

-apw
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