linux-kernel - Re: [PATCH RESEND v6 2/2] scripts: checkpatch: check unused parameters for function-like macro

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Date: Mon, 06 May 2024 09:11:35 -0700
From: Joe Perches <joe@...ches.com>
To: Barry Song <21cnbao@...il.com>
Cc: akpm@...ux-foundation.org, apw@...onical.com, broonie@...nel.org, 
 charlemagnelasse@...il.com, chenhuacai@...ngson.cn, chris@...kel.net, 
 corbet@....net, dwaipayanray1@...il.com, herbert@...dor.apana.org.au, 
 jcmvbkbc@...il.com, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org,  linux@...ck-us.net, lukas.bulwahn@...il.com,
 mac.xxn@...look.com,  quic_jjohnson@...cinc.com, sfr@...b.auug.org.au,
 v-songbaohua@...o.com,  workflows@...r.kernel.org
Subject: Re: [PATCH RESEND v6 2/2] scripts: checkpatch: check unused
 parameters for function-like macro

On Mon, 2024-05-06 at 19:16 +1200, 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.
> > []
> > > 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 precedence 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" . "$herectx");
> > 
> > trivia:  This should be aligned to the open parenthesis.
> > 
> 
> Hi Joe,
> I assume you mean the below?
> 
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index 9895d7e38a9f..2b812210b412 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -6044,7 +6044,7 @@ sub process {
>  # check if this is an unused argument
>  				if ($define_stmt !~ /\b$arg\b/) {
>  					WARN("MACRO_ARG_UNUSED",
> -						"Argument '$arg' is not used in function-like macro\n" . "$herectx");
> +					     "Argument '$arg' is not used in function-like macro\n" . "$herectx");
>  				}
>  			}
> > Otherwise:
> > Acked-by: Joe Perches <joe@...ches.com>

Yes, but please send a v7 instead of a separate patch
to akpm or perhaps Andrew could combine them or fix it
when applying v6