linux-kernel - Re: [PATCH] Documentation: coding-style: ask function-like macros to evaluate parameters

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Date: Wed, 20 Mar 2024 14:45:30 +1100
From: Stephen Rothwell <sfr@...b.auug.org.au>
To: Barry Song <21cnbao@...il.com>
Cc: corbet@....net, workflows@...r.kernel.org, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org, Barry Song <v-songbaohua@...o.com>, Andrew
 Morton <akpm@...ux-foundation.org>, Chris Zankel <chris@...kel.net>, Huacai
 Chen <chenhuacai@...ngson.cn>, Herbert Xu <herbert@...dor.apana.org.au>,
 Guenter Roeck <linux@...ck-us.net>, Max Filippov <jcmvbkbc@...il.com>
Subject: Re: [PATCH] Documentation: coding-style: ask function-like macros
 to evaluate parameters

Hi Barry,

On Wed, 20 Mar 2024 16:24:30 +1300 Barry Song <21cnbao@...il.com> wrote:
>
> On Wed, Mar 20, 2024 at 2:42 PM Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> >
> > On Wed, 20 Mar 2024 13:16:56 +1300 Barry Song <21cnbao@...il.com> wrote:  
> > >
> > > diff --git a/Documentation/process/coding-style.rst b/Documentation/process/coding-style.rst
> > > index 9c7cf7347394..8065747fddff 100644
> > > --- a/Documentation/process/coding-style.rst
> > > +++ b/Documentation/process/coding-style.rst
> > > @@ -827,6 +827,13 @@ Macros with multiple statements should be enclosed in a do - while block:
> > >                               do_this(b, c);          \
> > >               } while (0)
> > >
> > > +Function-like macros should evaluate their parameters, for unused parameters,
> > > +cast them to void:
> > > +
> > > +.. code-block:: c
> > > +
> > > +     #define macrofun(a) do { (void) (a); } while (0)
> > > +  
> >
> > Maybe add some comment about using a static inline function for these
> > simple versions instead, if at all possible, (it is suggested just
> > above this section) since that will still type check arguments.  
> 
> right, what about adding the below section together with the above (void) cast?
> 
> +Another approach could involve utilizing a static inline function to replace
> +the macro.:
> +
> +.. code-block:: c
> +
> +       static inline void fun(struct foo *foo)
> +       {
> +       }
> +

Looks good to me.

-- 
Cheers,
Stephen Rothwell

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