linux-kernel - Re: [PATCH v2] checkpatch.pl: Warn on duplicate sysctl local variable

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Date:   Thu, 30 May 2019 20:06:58 -0700
From:   Joe Perches <joe@...ches.com>
To:     Matteo Croce <mcroce@...hat.com>, linux-kernel@...r.kernel.org,
        Andy Whitcroft <apw@...onical.com>
Cc:     Kees Cook <keescook@...omium.org>,
        Aaron Tomlin <atomlin@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v2] checkpatch.pl: Warn on duplicate sysctl local
 variable

On Fri, 2019-05-31 at 03:12 +0200, Matteo Croce wrote:
> Commit 6a33853c5773 ("proc/sysctl: add shared variables for range check")
> adds some shared const variables to be used instead of a local copy in
> each source file.
> Warn when a chunk duplicates one of these values in a ctl_table struct:
> 
>     $ scripts/checkpatch.pl 0001-test-commit.patch
>     WARNING: duplicated sysctl range checking value 'zero', consider using the shared one in include/linux/sysctl.h
>     #27: FILE: arch/arm/kernel/isa.c:48:
>     +               .extra1         = &zero,
> 
>     WARNING: duplicated sysctl range checking value 'int_max', consider using the shared one in include/linux/sysctl.h
>     #28: FILE: arch/arm/kernel/isa.c:49:
>     +               .extra2         = &int_max,
> 
>     total: 0 errors, 2 warnings, 14 lines checked
> 
> Signed-off-by: Matteo Croce <mcroce@...hat.com>
> ---
>  scripts/checkpatch.pl | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index 342c7c781ba5..629c31435487 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -6639,6 +6639,12 @@ sub process {
>  				     "unknown module license " . $extracted_string . "\n" . $herecurr);
>  			}
>  		}
> +
> +# check for sysctl duplicate constants
> +		if ($line =~ /\.extra[12]\s*=\s*&(zero|one|int_max|max_int)\b/) {

why max_int, there isn't a single use of it in the kernel ?