linux-kernel - Re: [PATCH] checkpatch: try to catch missing VMLINUX

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Message-ID: <20081112140250.GF8302@shadowen.org>
Date:	Wed, 12 Nov 2008 14:02:50 +0000
From:	Andy Whitcroft <apw@...dowen.org>
To:	Mike Frysinger <vapier@...too.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] checkpatch: try to catch missing VMLINUX_SYMBOL() in
	vmlinux.lds.h

On Sat, Nov 08, 2008 at 05:56:05PM -0500, Mike Frysinger wrote:
> Seems like every other release we have someone who updates vmlinux.lds.h and
> adds C-visible symbols without VMLINUX_SYMBOL() around them.  So start
> checking the file and only allow assignments that use one of the following
> symbols on a side:
> 	.
> 	ALIGN(...)
> 	VMLINUX_SYMBOL(...)
> 
> Signed-off-by: Mike Frysinger <vapier@...too.org>
> ---
>  scripts/checkpatch.pl |   13 +++++++++++++
>  1 files changed, 13 insertions(+), 0 deletions(-)
> 
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index f88bb3e..8e96b42 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -2189,6 +2189,19 @@ sub process {
>  			}
>  		}
>  
> +# make sure symbols are always wrapped with VMLINUX_SYMBOL() ...
> +# all assignments may have only one of the following with an assignment:
> +#	.
> +#	ALIGN(...)
> +#	VMLINUX_SYMBOL(...)
> +		if ($realfile =~ /vmlinux.lds.h$/) {
> +			if ($line =~ /=/ &&
> +			    !($line =~ /([.]|(ALIGN|VMLINUX_SYMBOL)[(][^=]*[)])\s*=\s*([.]|(ALIGN|VMLINUX_SYMBOL)[(][^=]*[)])/))
> +			{
> +				WARN("vmlinux.lds.h needs VMLINUX_SYMBOL() around C-visible symbols\n" . $herecurr);
> +			}
> +		}
> +
>  # check for redundant bracing round if etc
>  		if ($line =~ /(^.*)\bif\b/ && $1 !~ /else\s*$/) {
>  			my ($level, $endln, @chunks) =
> -- 

Ok, that seems like a sane check.  I think what we are really wanting
to check for is assigments with plain identifiers on either side?  I've
pushed a softened version of this check to my tree for testing.

  http://www.kernel.org/pub/linux/kernel/people/apw/checkpatch/checkpatch.pl-testing

-apw
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