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Date:   Fri, 16 Oct 2020 16:12:37 +0200
From:   Andrew Lunn <andrew@lunn.ch>
To:     Masahiro Yamada <masahiroy@kernel.org>
Cc:     Arnd Bergmann <arnd@arndb.de>,
        Nick Desaulniers <ndesaulniers@google.com>,
        netdev <netdev@vger.kernel.org>,
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        Rohit Maheshwari <rohitm@chelsio.com>,
        Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
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Subject: Re: [PATCH net-next v2 1/2] Makefile.extrawarn: Add symbol for W=1
 warnings for today
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> One drawback of your approach is that
> you cannot set KBUILD_CFLAGS_W1_20200930
> until you eliminate all the warnings in the
> sub-directory in interest.
> (i.e. all or nothing approach)

Hi Mashiro

That actual works well for my use case. drivers/net/ethernet is W=1
clean. So is drivers/net/phy, drivers/net/mdio. Developers generally
clean up a subsystem by adding W=1 to the command line because that is
the simple tool they have.

And my aim here is to keep those subsystem W=1 clean. I don't care
about individual warnings within W=1, because those subsystems are
passed that stage already.

    Andrew