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Message-ID: <2febb7893346b6234983453de7c037536e479bfc.camel@perches.com>
Subject: Re: [PATCH v4] checkpatch: warn for non-standard fixes tag style
From:   Joe Perches <joe@perches.com>
To:     "niklas.soderlund@corigine.com" <niklas.soderlund@corigine.com>,
        Philippe Schenker <philippe.schenker@toradex.com>
Cc:     "corbet@lwn.net" <corbet@lwn.net>,
        "dwaipayanray1@gmail.com" <dwaipayanray1@gmail.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
        "lukas.bulwahn@gmail.com" <lukas.bulwahn@gmail.com>,
        "apw@canonical.com" <apw@canonical.com>,
        "sfr@canb.auug.org.au" <sfr@canb.auug.org.au>,
        "louis.peens@corigine.com" <louis.peens@corigine.com>,
        "simon.horman@corigine.com" <simon.horman@corigine.com>,
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Date:   Sat, 10 Sep 2022 19:47:57 -0700
In-Reply-To: <9f9a0740aef282d30af8fa02ca7c6479e80aa9a0.camel@perches.com>
References: <20220908164434.122106-1-niklas.soderlund@corigine.com>
         <3275d886491dc934e3277cde9cc766b0ce0886ea.camel@toradex.com>
         <Yxrt1aa60xY0H7j0@oden.dyn.berto.se>
         <9f9a0740aef282d30af8fa02ca7c6479e80aa9a0.camel@perches.com>
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On Fri, 2022-09-09 at 10:57 -0700, Joe Perches wrote:
> On Fri, 2022-09-09 at 09:40 +0200, niklas.soderlund@corigine.com wrote:
> > On 2022-09-08 17:49:14 +0000, Philippe Schenker wrote:
[]
> > > I would check all lines that start with fixes, even if there is
> > > whitespace in front (and then failing later on...)
> > > 
> > > if (!$in_header_lines && $line =~ /^\s*fixes:?/i) {
> 
> I think that's a poor idea.
> 
> You should really review git history for lines that start with fixes
> and look at the number of false positives that would give.
> 
> Try this grep:
> 
> $ git log -100000 --no-merges --grep="^\s*fixes" -i --format=email -P | \
>   grep -P -i "^\s*fixes)" | \
>   grep -P -v "^Fixes: [0-9a-f]{12,}'
> [...]
> 
> That is a greater than 10% false positive rate.

One day I'll be better at typing grep commands in the editor...

Try:

$ git log -100000 --no-merges --grep="^\s*fixes" -i --format=email -P | \
  grep -P -i "^\s*fixes" | \
  grep -P -v "^Fixes: [0-9a-f]{12,}"