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Message-ID: <fc2875ed63b9d2b2e94893f9af425cbbedb75d3e.camel@perches.com>
Subject: Re: [PATCH] kdb: Get rid of broken attempt to print CCVERSION in
 kdb summary
From:   Joe Perches <joe@perches.com>
To:     Andrew Morton <akpm@linux-foundation.org>
Cc:     Masahiro Yamada <yamada.masahiro@socionext.com>,
        Douglas Anderson <dianders@chromium.org>,
        Daniel Thompson <daniel.thompson@linaro.org>,
        Jason Wessel <jason.wessel@windriver.com>,
        Christophe Leroy <christophe.leroy@c-s.fr>,
        "Peter Zijlstra (Intel)" <peterz@infradead.org>,
        Kees Cook <keescook@chromium.org>,
        kgdb-bugreport@lists.sourceforge.net,
        Johannes Weiner <hannes@cmpxchg.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        "Gustavo A. R. Silva" <gustavo@embeddedor.com>,
        Nicholas Mc Guire <hofrat@osadl.org>
Date:   Fri, 19 Apr 2019 20:57:05 -0700
In-Reply-To: <20190419135830.0e3273e223fb83947e5adb0d@linux-foundation.org>
References: <20190323015227.245455-1-dianders@chromium.org>
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         <20190416163034.3e642818ebf27ed6891c1981@linux-foundation.org>
         <CAK7LNAR4Ty8835sfo4HSvBsMCsV65mY2HOajFSY2TOYurmkFdw@mail.gmail.com>
         <20190418160651.40cb6a11186a6c6028e9d20d@linux-foundation.org>
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         <e5f29ca9b6067fff9ea68cb25e15906659cd51ad.camel@perches.com>
         <20190419135830.0e3273e223fb83947e5adb0d@linux-foundation.org>
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On Fri, 2019-04-19 at 13:58 -0700, Andrew Morton wrote:
> On Fri, 19 Apr 2019 04:14:27 -0700 Joe Perches <joe@perches.com> wrote:
> > On Fri, 2019-04-19 at 12:28 +0900, Masahiro Yamada wrote:
> > > Can you detect redundant Cc: by checkpatch?
[]
> > I'm not sure why it's useful or necessary.
[]
> The issue here is redundant Cc: lines in the changelog.

CC: entries have very little actual value in a changelog anyway.

> > --- a/scripts/checkpatch.pl
[]
> > @@ -2688,6 +2688,19 @@ sub process {
> >  				$signatures{$sig_nospace} = 1;
> >  			}
> >  
> > +# Check for a cc: line with another signature -by: by the same author
> > +			if ($sig_nospace =~ /^cc:/) {
> > +				my $sig_email = substr($sig_nospace, 3);
> > +				foreach my $sig (sort keys %signatures) {
> > +					next if ($sig =~ /^cc:/);
> > +					$sig =~ s/^[^:]+://;
> > +					if ($sig eq $sig_email) {
> > +						WARN("BAD_SIGN_OFF",
> > +						     "Unnecessary CC: as there is another signature with the same name/email address\n" . $herecurr);
> > +					}
> > +				}
> > +			}
> > +
> >  # Check Co-developed-by: immediately followed by Signed-off-by: with same name and email
> >  			if ($sign_off =~ /^co-developed-by:$/i) {
> >  				if ($email eq $author) {
> 
> Thanks.  But my checkpatch.pl is different from yours.
> 
> q:/usr/src/25> grep "immediately followed by" scripts/checkpatch.pl
> q:/usr/src/25> 

I almost always write patches against -next

$ git grep "immediately followed by" next-20190418 -- scripts/checkpatch.pl
next-20190418:scripts/checkpatch.pl:# Check Co-developed-by: immediately followed by Signed-off-by: with same name and email
next-20190418:scripts/checkpatch.pl:                                             "Co-developed-by: must be immediately followed by Signed-off-by:\n" . "$here\n" . $rawline);
next-20190418:scripts/checkpatch.pl:                                         "Co-developed-by: must be immediately followed by Signed-off-by:\n" . "$here\n" . $rawline . "\n" .$rawlines[$linenr]);

You seem to be missing

commit 6c5d24eef7be7adfcb608f2852ab69b58935133b
Author: Sean Christopherson <sean.j.christopherson@intel.com>
Date:   Fri Mar 22 14:11:37 2019 -0700

    checkpatch: Warn on improper usage of Co-developed-by
    
    The purpose of Co-developed-by: is to give attribution to authors who
    aren't already attributed by the From: tag, i.e. who aren't the nominal
    patch author.  Because Co-developed-by: is essentially a variation of
    From:, it must be accompanied by a Signed-off-by: of the associated
    co-author.  To ease the burden of determining whether or not co-authors
    have signed off, Co-developed-by and Signed-off-by: must be explicitly
    paired, i.e. on consecutive lines for a given co-author.
    
    Suggested-by: Joe Perches <joe@perches.com>
    Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
    Signed-off-by: Jonathan Corbet <corbet@lwn.net>