linux-kernel - Re: [PATCH -next v2] checkpatch: Add check for array allocator family argument order

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Message-ID: <CAKXUXMxi_aqnvCmYjakQzoYvYqqwrvMnFt-czLV1iUnO0TnScg@mail.gmail.com>
Date:   Fri, 4 Nov 2022 09:35:37 +0100
From:   Lukas Bulwahn <lukas.bulwahn@...il.com>
To:     Liao Chang <liaochang1@...wei.com>
Cc:     apw@...onical.com, joe@...ches.com, dwaipayanray1@...il.com,
        linux-kernel@...r.kernel.org, bagasdotme@...il.com,
        pbonzini@...hat.com
Subject: Re: [PATCH -next v2] checkpatch: Add check for array allocator family
 argument order

On Fri, Nov 4, 2022 at 8:08 AM Liao Chang <liaochang1@...wei.com> wrote:
>
> These array allocator family are sometimes misused with the first and
> second arguments switchted.

Just a nit:

s/switchted/switched/

But probably you actually mean "swapped". I think there is a slight
difference between the two words, "switched" and "swapped". And here
the arguments are swapped. Note: I am also not a native speaker.

For the implementation change:

Acked-by: Lukas Bulwahn <lukas.bulwahn@...il.com>

How many new findings are now identified with this extended check on
linux-next? Could you run checkpatch on all files of linux-next and
share the new findings? Then we can do a quick scan if some instances
should be immediately fixed or some janitor should follow through with
such a task.

Lukas

>
> Same issue with calloc, kvcalloc, kvmalloc_array etc.
>
> Bleat if sizeof is the first argument.
>
> Link: https://lore.kernel.org/lkml/5374345c-7973-6a3c-d559-73bf4ac15079@redhat.com/
> Signed-off-by: Liao Chang <liaochang1@...wei.com>
> Acked-by: Joe Perches <joe@...ches.com>
> ---
> v2:
> 1. Acked-by Joe Perches.
> 2. Use lore links in Link tag.
>
> ---
>  scripts/checkpatch.pl | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index 1e5e66ae5a52..a9a9dc277cff 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -7128,7 +7128,7 @@ sub process {
>                 }
>
>  # check for alloc argument mismatch
> -               if ($line =~ /\b((?:devm_)?(?:kcalloc|kmalloc_array))\s*\(\s*sizeof\b/) {
> +               if ($line =~ /\b((?:devm_)?((?:k|kv)?(calloc|malloc_array)(?:_node)?))\s*\(\s*sizeof\b/) {
>                         WARN("ALLOC_ARRAY_ARGS",
>                              "$1 uses number as first arg, sizeof is generally wrong\n" . $herecurr);
>                 }
> --
> 2.17.1
>