linux-kernel - Re: checkpatch.pl: false warning about "-p0 patch"

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Date:	Thu, 22 Aug 2013 14:57:39 -0700
From:	Joe Perches <joe@...ches.com>
To:	Brian Norris <computersforpeace@...il.com>
Cc:	Andy Whitcroft <apw@...onical.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: checkpatch.pl: false warning about "-p0 patch"

On Thu, 2013-08-22 at 14:45 -0700, Brian Norris wrote:
> Hello,

Hello.

> I have received what appears to be a false warning from checkpatch.pl when
> checking a patch named 'b':
> 
>     $ scripts/checkpatch.pl b
>     WARNING: patch prefix 'b' exists, appears to be a -p0 patch
> 
>     total: 0 errors, 1 warnings, 16 lines checked
> 
>     b has style problems, please review.
> 
>     If any of these errors are false positives, please report
>     them to the maintainer, see CHECKPATCH in MAINTAINERS.
> 
> It appears that I can trigger this warning with any arbitrary commit. The
> following bash script gives me at least one warning for everything in Linus'
> tree:
> 
>   for i in {0..100}
>   do
>       git format-patch -1 HEAD~$i --stdout > b
>       scripts/checkpatch.pl b
>   done
> 
> I have also seen this warning on patches with other names, but I'm not
> reproducing that right now.

checkpatch can use stdin as well as files/patches.

Try this instead of creating a temporary file:

for i in {0..100}
do
    git format-patch -1 --stdout HEAD~$1 | ./scripts/checkpatch.pl -
done


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