linux-kernel - Re: [PATCH v4 2/2] scripts: checkpatch: check unused parameters for function-like macro

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Date: Thu, 28 Mar 2024 09:01:33 -0700
From: Jeff Johnson <quic_jjohnson@...cinc.com>
To: Barry Song <21cnbao@...il.com>, <akpm@...ux-foundation.org>,
        <linux-doc@...r.kernel.org>
CC: <apw@...onical.com>, <broonie@...nel.org>, <chenhuacai@...ngson.cn>,
        <chris@...kel.net>, <corbet@....net>, <dwaipayanray1@...il.com>,
        <herbert@...dor.apana.org.au>, <joe@...ches.com>,
        <linux-kernel@...r.kernel.org>, <linux@...ck-us.net>,
        <lukas.bulwahn@...il.com>, <mac.xxn@...look.com>,
        <sfr@...b.auug.org.au>, <v-songbaohua@...o.com>,
        <workflows@...r.kernel.org>, Max Filippov
	<jcmvbkbc@...il.com>
Subject: Re: [PATCH v4 2/2] scripts: checkpatch: check unused parameters for
 function-like macro

On 3/27/2024 7:21 PM, Barry Song wrote:
> From: Xining Xu <mac.xxn@...look.com>
> 
> If function-like macros do not utilize a parameter, it might result in a
> build warning.  In our coding style guidelines, we advocate for utilizing
> static inline functions to replace such macros.  This patch verifies
> compliance with the new rule.
> 
> For a macro such as the one below,
> 
>  #define test(a) do { } while (0)
> 
> The test result is as follows.
> 
>  ERROR: Parameter 'a' is not used in function-like macro, please use static
>  inline instead
>  #21: FILE: mm/init-mm.c:20:
>  +#define test(a) do { } while (0)
> 
>  total: 1 errors, 0 warnings, 8 lines checked
> 
> Signed-off-by: Xining Xu <mac.xxn@...look.com>

if you are re-posting somebody else's work you need to add your own Signed-off-by

> Tested-by: Barry Song <v-songbaohua@...o.com>
> Cc: Chris Zankel <chris@...kel.net>
> Cc: Huacai Chen <chenhuacai@...ngson.cn>
> Cc: Herbert Xu <herbert@...dor.apana.org.au>
> Cc: Guenter Roeck <linux@...ck-us.net>
> Cc: Stephen Rothwell <sfr@...b.auug.org.au>
> Cc: Mark Brown <broonie@...nel.org>
> Cc: Andy Whitcroft <apw@...onical.com>
> Cc: Dwaipayan Ray <dwaipayanray1@...il.com>
> Cc: Joe Perches <joe@...ches.com>
> Cc: Jonathan Corbet <corbet@....net>
> Cc: Lukas Bulwahn <lukas.bulwahn@...il.com>
> Cc: Max Filippov <jcmvbkbc@...il.com>