netdev - Re: [PATCH] net/dsa: remove unused macros to tame gcc warning

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Date:   Fri, 6 Nov 2020 16:28:43 +0800
From:   Alex Shi <alex.shi@...ux.alibaba.com>
To:     Joe Perches <joe@...ches.com>, andrew@...n.ch
Cc:     Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net/dsa: remove unused macros to tame gcc warning



在 2020/11/6 下午2:36, Joe Perches 写道:
> On Fri, 2020-11-06 at 13:37 +0800, Alex Shi wrote:
>> There are some macros unused, they causes much gcc warnings. Let's
>> remove them to tame gcc.
> 
> I believe these to be essentially poor warnings.
> 
> Aren't these warnings generated only when adding  W=2 to the make
> command line?
> 
> Perhaps it's better to move the warning to level 3
> ---
> diff --git a/scripts/Makefile.extrawarn b/scripts/Makefile.extrawarn
> index 95e4cdb94fe9..5c3c220ddb32 100644
> --- a/scripts/Makefile.extrawarn
> +++ b/scripts/Makefile.extrawarn
> @@ -68,7 +68,6 @@ KBUILD_CFLAGS += $(call cc-option, -Wlogical-op)
>  KBUILD_CFLAGS += -Wmissing-field-initializers
>  KBUILD_CFLAGS += -Wtype-limits
>  KBUILD_CFLAGS += $(call cc-option, -Wmaybe-uninitialized)
> -KBUILD_CFLAGS += $(call cc-option, -Wunused-macros)

This changed too much, and impact others. May not good. :)

Thanks
Alex
>  
>  KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN2
>  
> @@ -89,6 +88,7 @@ KBUILD_CFLAGS += -Wredundant-decls
>  KBUILD_CFLAGS += -Wsign-compare
>  KBUILD_CFLAGS += -Wswitch-default
>  KBUILD_CFLAGS += $(call cc-option, -Wpacked-bitfield-compat)
> +KBUILD_CFLAGS += $(call cc-option, -Wunused-macros)
>  
>  KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN3
>  
>