linux-kernel - Re: [PATCH 2/7] kbuild: Add P= command line flag to run checkpatch

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Date:   Tue, 21 Nov 2017 01:18:47 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Knut Omang <knut.omang@...cle.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Michal Marek <mmarek@...e.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Subject: Re: [PATCH 2/7] kbuild: Add P= command line flag to run checkpatch

2017-11-17 2:01 GMT+09:00 Knut Omang <knut.omang@...cle.com>:
> Add interpretation of a new environment variable P={1,2} in spirit of the
> C= option, but executing checkpatch instead of sparse.
>
> Signed-off-by: Knut Omang <knut.omang@...cle.com>
> Reviewed-by: Håkon Bugge <haakon.bugge@...cle.com>
> Acked-by: Åsmund Østvold <asmund.ostvold@...cle.com>
> ---
>  Makefile               | 20 +++++++++++++++++++-
>  scripts/Makefile.build | 13 +++++++++++++
>  2 files changed, 32 insertions(+), 1 deletion(-)
>
> diff --git a/Makefile b/Makefile
> index ccd9818..eb4bca9 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -176,6 +176,20 @@ ifndef KBUILD_CHECKSRC
>    KBUILD_CHECKSRC = 0
>  endif
>
> +# Run scripts/checkpatch.pl with --ignore-cfg checkpatch.cfg
> +#
> +# Use 'make P=1' to enable checking of only re-compiled files.
> +# Use 'make P=2' to enable checking of *all* source files, regardless
> +#
> +# See the file "Documentation/dev-tools/run-checkpatch.rst" for more details,
> +#
> +ifeq ("$(origin P)", "command line")
> +  KBUILD_CHECKPATCH = $(P)
> +endif
> +ifndef KBUILD_CHECKPATCH
> +  KBUILD_CHECKPATCH = 0
> +endif


I am unhappy about adding a new interface
for each checker.

The default of CHECK is "sparse", but
users can override it to use another checker.



As Decumentation/dev-tools/coccinelle.rst says,
if you want to use coccinelle as a checker,

make C=1 CHECK="scripts/coccicheck"


Recently, I saw a patch to use scripts/kernel-doc as a checker.
https://patchwork.kernel.org/patch/10030521/



If I accept your patch,
we would end up with

KBUILD_CHECKPATCH,
KBUILD_CHECKCOCCI
KBUILD_CHECKDOC,
...


This is ugly.



-- 
Best Regards
Masahiro Yamada