linux-kernel - Re: checkpatch: question about "patch prefix 'b' exists" warning

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Date:   Sun, 25 Sep 2022 03:03:28 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Andy Whitcroft <apw@...onical.com>, Joe Perches <joe@...ches.com>,
        Dwaipayan Ray <dwaipayanray1@...il.com>,
        Lukas Bulwahn <lukas.bulwahn@...il.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: checkpatch: question about "patch prefix 'b' exists" warning

(+CC: LKML)

On Sun, Sep 25, 2022 at 3:00 AM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> Hi.
>
>
> When I used scripts/checkpatch.pl to check a patch file
> generated by 'git format-patch', I observed this warning,
>
>
>   WARNING: patch prefix 'b' exists, appears to be a -p0 patch
>
>
>
> I did not understand what was causing this warning until
> I saw the source code of ./scripts/checkpatch.pl
>
>
>
> It looks like the presence of the file 'b' triggers this warning.
>
>
>
> $ ./scripts/checkpatch.pl 0001-kbuild-re-run-modpost-when-it-is-updated.patch
> total: 0 errors, 0 warnings, 48 lines checked
>
> 0001-kbuild-re-run-modpost-when-it-is-updated.patch has no obvious
> style problems and is ready for submission.
>
>
> $ touch b
> $ ./scripts/checkpatch.pl 0001-kbuild-re-run-modpost-when-it-is-updated.patch
> WARNING: patch prefix 'b' exists, appears to be a -p0 patch
>
> total: 0 errors, 1 warnings, 48 lines checked
>
> NOTE: For some of the reported defects, checkpatch may be able to
>       mechanically convert to the typical style using --fix or --fix-inplace.
>
> 0001-kbuild-re-run-modpost-when-it-is-updated.patch has style
> problems, please review.
>
> NOTE: If any of the errors are false positives, please report
>       them to the maintainer, see CHECKPATCH in MAINTAINERS.
>
>
>
>
>
> Is this intentional behavior?
>
>
>
>
>
>
> --
> Best Regards
> Masahiro Yamada



-- 
Best Regards
Masahiro Yamada