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Message-ID: <5e26f82913801050afa4442dfb9a07249895ab98.camel@perches.com>
Subject: Re: [PATCH RESEND v6 2/2] scripts: checkpatch: check unused
 parameters for function-like macro
From: Joe Perches <joe@perches.com>
To: Barry Song <21cnbao@gmail.com>, akpm@linux-foundation.org, 
	linux-doc@vger.kernel.org
Cc: apw@canonical.com, broonie@kernel.org, chenhuacai@loongson.cn, 
 chris@zankel.net, corbet@lwn.net, dwaipayanray1@gmail.com, 
 herbert@gondor.apana.org.au, linux-kernel@vger.kernel.org,
 linux@roeck-us.net,  lukas.bulwahn@gmail.com, mac.xxn@outlook.com,
 sfr@canb.auug.org.au,  v-songbaohua@oppo.com, workflows@vger.kernel.org,
 Max Filippov <jcmvbkbc@gmail.com>,  Jeff Johnson
 <quic_jjohnson@quicinc.com>, Charlemagne Lasse <charlemagnelasse@gmail.com>
Date: Sun, 05 May 2024 22:33:18 -0700
In-Reply-To: <20240506014606.8638-3-21cnbao@gmail.com>
References: <20240506014606.8638-1-21cnbao@gmail.com>
	 <20240506014606.8638-3-21cnbao@gmail.com>
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On Mon, 2024-05-06 at 13:46 +1200, Barry Song wrote:
> From: Xining Xu <mac.xxn@outlook.com>
>=20
> 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.
[]
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
[]
> @@ -6040,6 +6040,12 @@ sub process {
>  					CHK("MACRO_ARG_PRECEDENCE",
>  					    "Macro argument '$arg' may be better as '($arg)' to avoid prece=
dence issues\n" . "$herectx");
>  				}
> +
> +# check if this is an unused argument
> +				if ($define_stmt !~ /\b$arg\b/) {
> +					WARN("MACRO_ARG_UNUSED",
> +						"Argument '$arg' is not used in function-like macro\n" . "$herectx=
");

trivia:  This should be aligned to the open parenthesis.

Otherwise:
Acked-by: Joe Perches <joe@perches.com>