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From: Masahiro Yamada <masahiroy@kernel.org>
To: Andrew Lunn <andrew@lunn.ch>
Cc: Arnd Bergmann <arnd@arndb.de>,
	Nick Desaulniers <ndesaulniers@google.com>,
	netdev <netdev@vger.kernel.org>,
	David Miller <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Michal Marek <michal.lkml@markovi.net>,
	Rohit Maheshwari <rohitm@chelsio.com>,
	Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
	clang-built-linux <clang-built-linux@googlegroups.com>
Subject: Re: [PATCH net-next v2 1/2] Makefile.extrawarn: Add symbol for W=1 warnings for today
Date: Sun, 11 Oct 2020 22:03:45 +0900	[thread overview]
Message-ID: <CAK7LNASB6ashOzmL5XntkPSq9a+8VoWCowP5CAt+oX0o=0y=dA@mail.gmail.com> (raw)
In-Reply-To: <20201005210808.GE56634@lunn.ch>

On Tue, Oct 6, 2020 at 6:08 AM Andrew Lunn <andrew@lunn.ch> wrote:
>
> > It depends a lot on what portion of the kernel gets enabled for W=1.
> >
> > As long as it's only drivers that are actively maintained, and they
> > make up a fairly small portion of all code, it should not be a problem
> > to find someone to fix useful warnings.
>
> Well, drivers/net/ethernet is around 1.5M LOC. The tree as a whole is
> just short of 23M LOC. So i guess that is a small portion of all the
> code.
>
>         Andrew


I am not a big fan of KBUILD_CFLAGS_W1_<timestamp>
since it is ugly.

I'd like to start with adding individual flags
like drivers/gpu/drm/i915/Makefile, and see
how difficult it would be to maintain it.

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)

At best, you can only work out from 'old -> new' order
because KBUILD_CFLAGS_W1_20200326 is a suer-set of
KBUILD_CFLAGS_W1_20190907, which is a suer-set of
KBUILD_CFLAGS_W1_20190617 ...



If you add flags individually, you can start with
low-hanging fruits, or ones with higher priority
as Arnd mentions about -Wmissing-{declaration,prototypes}.


For example, you might be able to set
'subdir-ccflags-y += -Wmissing-declarations'
to drivers/net/Makefile, while
'subdir-ccflags-y += -Wunused-but-set-variable'
stays in drivers/net/ethernet/Makefile.



--
Best Regards
Masahiro Yamada

  reply	other threads:[~2020-10-11 13:09 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-01  1:12 [RFC PATCH net-next v2 0/2] driver/net/ethernet W=1 by default Andrew Lunn
2020-10-01  1:12 ` [PATCH net-next v2 1/2] Makefile.extrawarn: Add symbol for W=1 warnings for today Andrew Lunn
2020-10-01 23:09   ` Nick Desaulniers
2020-10-02  1:44     ` Andrew Lunn
2020-10-02 12:20       ` Arnd Bergmann
2020-10-02 12:51         ` Andrew Lunn
2020-10-02 13:15           ` Arnd Bergmann
2020-10-12  1:00         ` Masahiro Yamada
2020-10-12  8:05           ` Arnd Bergmann
2020-10-05 17:31       ` Nick Desaulniers
2020-10-05 19:49         ` Andrew Lunn
2020-10-05 20:03           ` Arnd Bergmann
2020-10-05 21:08             ` Andrew Lunn
2020-10-11 13:03               ` Masahiro Yamada [this message]
2020-10-12  8:11                 ` Arnd Bergmann
2020-10-16 14:12                 ` Andrew Lunn
     [not found]                   ` <CAK8P3a1nBhmf1PQwHHbEjiVgRTXi4UuJAbwuK92CKEbR=yKGWw@mail.gmail.com>
2020-10-17 14:57                     ` Andrew Lunn
2020-10-02  9:04   ` kernel test robot
2020-10-02  9:04     ` kernel test robot
2020-10-02 11:08   ` kernel test robot
2020-10-02 11:08     ` kernel test robot
2020-10-01  1:12 ` [PATCH net-next v2 2/2] driver/net/ethernet: Sign up for W=1 as defined on 20200930 Andrew Lunn

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