linux-kernel - Re: [PATCH] Kbuild: enable -Wunused-macros warning for "make W=1"

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Message-ID: <CAK7LNATUHBZYMA7Bv4T4bM2ygzCZ5v2yLtyWYLATvR+hLCKAdg@mail.gmail.com>
Date:   Fri, 25 Aug 2017 01:19:39 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Johannes Thumshirn <jthumshirn@...e.de>
Cc:     Michal Marek <mmarek@...e.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Kbuild: enable -Wunused-macros warning for "make W=1"

Hi Johannes,

2017-08-03 19:09 GMT+09:00 Johannes Thumshirn <jthumshirn@...e.de>:
> We have lots of dead defines and macros in drivers, lets offer users a way
> to detect and eventually remove them.
>
> Signed-off-by: Johannes Thumshirn <jthumshirn@...e.de>
> ---
>  scripts/Makefile.extrawarn | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/scripts/Makefile.extrawarn b/scripts/Makefile.extrawarn
> index fb3522fd8702..8ab8bc91da55 100644
> --- a/scripts/Makefile.extrawarn
> +++ b/scripts/Makefile.extrawarn
> @@ -25,6 +25,7 @@ warning-1 += -Wold-style-definition
>  warning-1 += $(call cc-option, -Wmissing-include-dirs)
>  warning-1 += $(call cc-option, -Wunused-but-set-variable)
>  warning-1 += $(call cc-option, -Wunused-const-variable)
> +warning-1 += $(call cc-option, -Wunused-macros)
>  warning-1 += $(call cc-disable-warning, missing-field-initializers)
>  warning-1 += $(call cc-disable-warning, sign-compare)


This makes W=1 too noisy.

For example, drivers often define unused register macros
for completeness.  I do not think it is too bad in my opinion.

Perhaps, should it be moved to warning-2 ?






-- 
Best Regards
Masahiro Yamada