linux-kernel - Re: [Ksummit-discuss] [PATCH v2 0/3] Maintainer Entry Profiles

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Date:   Fri, 13 Sep 2019 13:33:14 -0700
From:   Joe Perches <joe@...ches.com>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     Rob Herring <robherring2@...il.com>,
        Bart Van Assche <bvanassche@....org>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        ksummit <ksummit-discuss@...ts.linuxfoundation.org>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Steve French <stfrench@...rosoft.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        "Tobin C. Harding" <me@...in.cc>
Subject: Re: [Ksummit-discuss] [PATCH v2 0/3] Maintainer Entry Profiles

On Fri, 2019-09-13 at 16:17 -0300, Mauro Carvalho Chehab wrote:
> Em Fri, 13 Sep 2019 11:42:38 -0700
> Joe Perches <joe@...ches.com> escreveu:
[]
> > Just fyi:  for an x86-64 defconfig with gcc 8.3
> > 
> > $ { make clean ; make defconfig ; make -j4 W=1 ; } > make.log 2>&1
> > 
> > There are ~300 W=1 for non kernel-doc -W<foo> warnings.
> > 
> > $ grep -i -P -oh '\[\-W[\w\-]+\]' make.log |sort | uniq -c | sort -rn
> >     163 [-Wmissing-prototypes]
> >      69 [-Wunused-but-set-variable]
> >      16 [-Wempty-body]
> >      10 [-Wtype-limits]
> >       6 [-Woverride-init]
> >       2 [-Wstringop-truncation]
> >       2 [-Wcast-function-type]
> >       1 [-Wunused-but-set-parameter]
> 
> On my eyes, it doesn't sound too much.

In general, I agree and most of these are pretty
trivial to remove.  It'd just take some time to
remove most of the missing-prototypes and
unused-but-set warnings before being able to
enable the warnings at the default W=0.

> I suspect that, 
> with gcc-9, it should produce more warnings, though.

It doesn't though.
At least not so far as I can tell.
gcc-9.1 produces the same output.

$ { make clean ; make defconfig ; make CC=/usr/bin/gcc-9 -j4 W=1 V=1 ; } > make_gcc9.log 2>&1
$  grep -i -P -oh '\[\-W[\w\-]+\]' make_gcc9.log | sort | uniq -c | sort -rn
    163 [-Wmissing-prototypes]
     69 [-Wunused-but-set-variable]
     16 [-Wempty-body]
     10 [-Wtype-limits]
      6 [-Woverride-init]
      2 [-Wstringop-truncation]
      2 [-Wcast-function-type]
      1 [-Wunused-but-set-parameter]