linux-kernel - Re: [PATCH 2/5] checkpatch: fix hang in relative indent checking

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Message-ID: <20090930152426.GC2957@shadowen.org>
Date:	Wed, 30 Sep 2009 16:24:26 +0100
From:	Andy Whitcroft <apw@...onical.com>
To:	Daniel Walker <dwalker@...o99.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] checkpatch: fix hang in relative indent checking

On Mon, Sep 21, 2009 at 07:14:48PM -0700, Daniel Walker wrote:
> I ran this command on v2.6.31 ,
> 
> ./scripts/checkpatch.pl --file net/decnet/dn_fib.c
> 
> which resulted in checkpatch hanging without any output.
> 
> The lines that cause the hang are,
> 
> #define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\
>         for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++)
> 
> The hang happend in the relative indent checking code. Checkpatch has the
> following comment around the relative indent checking block,
> 
> # Also ignore a loop construct at the end of a
> # preprocessor statement.
> 
> Since the line it's hanging on exactly fits the comment it shouldn't even be
> checking this line. To resolve this I just prevent the checking like the
> comment says should happen.

Ok, this actually seems to have already been fixed in the version Andrew
already has.  Specifically it was fixed by the change in:

    checkpatch: indent checks -- stop when we run out of continuation lines

I assume this is happening with v0.28?  Could you retest that one with
the version at the URL below for me to confirm.

  http://www.kernel.org/pub/linux/kernel/people/apw/checkpatch/checkpatch.pl-0.29

Thanks for the patch.

-apw
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