Re: [PATCH v6] checkpatch: warn for non-standard fixes tag style

[Dwaipayan Ray]

On Sun, Sep 11, 2022 at 9:08 PM Philippe Schenker
<philippe.schenker@xxxxxxxxxxx> wrote:
>
> On Sat, 2022-09-10 at 10:38 +0200, Niklas Söderlund wrote:
> > Add a warning for fixes tags that does not fall in line with the
> > standards specified by the community.
> >
> > Signed-off-by: Niklas Söderlund <niklas.soderlund@xxxxxxxxxxxx>
> > Reviewed-by: Simon Horman <simon.horman@xxxxxxxxxxxx>
> > Reviewed-by: Louis Peens <louis.peens@xxxxxxxxxxxx>
>
> Reviewed-by: Philippe Schenker <philippe.schenker@xxxxxxxxxxx>
>

For the documentation part,
Acked-by: Dwaipayan Ray <dwaipayanray1@xxxxxxxxx>

Thanks.

> > ---
> > * Changes since v5
> > - Add support for --fix option for checkpatch.pl.
> >
> > * Changes since v4
> > - Extend test to cover lines with whitespace before the fixes: tag,
> > e.g.
> >   match check on /^\s*fixes:?/i.
> >
> > * Changes since v3
> > - Add test that title in tag match title of commit referenced by sha1.
> >
> > * Changes since v2
> > - Change the pattern to match on 'fixes:?' to catch more malformed
> >   tags.
> >
> > * Changes since v1
> > - Update the documentation wording and add mention one cause of the
> >   message can be that email program splits the tag over multiple
> > lines.
> > ---
> >  Documentation/dev-tools/checkpatch.rst |  8 +++++
> >  scripts/checkpatch.pl                  | 43
> > ++++++++++++++++++++++++++
> >  2 files changed, 51 insertions(+)
> >
> > diff --git a/Documentation/dev-tools/checkpatch.rst
> > b/Documentation/dev-tools/checkpatch.rst
> > index b52452bc2963..8c8456a3bd18 100644
> > --- a/Documentation/dev-tools/checkpatch.rst
> > +++ b/Documentation/dev-tools/checkpatch.rst
> > @@ -612,6 +612,14 @@ Commit message
> >
> >      See:
> > https://www.kernel.org/doc/html/latest/process/submitting-patches.html#describe-your-changes
> >
> > +  **BAD_FIXES_TAG**
> > +    The Fixes: tag is malformed or does not fall in line with the
> > standards
> > +    specified by the community. This can occur if the tag have been
> > split into
> > +    multiple lines (e.g., when pasted in email program with word
> > wrapping
> > +    enabled).
> > +
> > +    See:
> > https://www.kernel.org/doc/html/latest/process/submitting-patches.html#describe-your-changes
> > +
> >
> >  Comparison style
> >  ----------------
> > diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> > index 79e759aac543..77f577535fc3 100755
> > --- a/scripts/checkpatch.pl
> > +++ b/scripts/checkpatch.pl
> > @@ -3140,6 +3140,49 @@ sub process {
> >                         }
> >                 }
> >
> > +# Check Fixes: styles is correct
> > +               if (!$in_header_lines && $line =~ /^\s*fixes:?/i) {
> > +                       my $orig_commit = "";
> > +                       my $id = "0123456789ab";
> > +                       my $title = "commit title";
> > +                       my $tag_case = 1;
> > +                       my $tag_space = 1;
> > +                       my $id_length = 1;
> > +                       my $id_case = 1;
> > +                       my $title_has_quotes = 0;
> > +
> > +                       if ($line =~ /(\s*fixes:?)\s+([0-9a-
> > f]{5,})\s+($balanced_parens)/i) {
> > +                               my $tag = $1;
> > +                               $orig_commit = $2;
> > +                               $title = $3;
> > +
> > +                               $tag_case = 0 if $tag eq "Fixes:";
> > +                               $tag_space = 0 if ($line =~ /^fixes:?
> > [0-9a-f]{5,} ($balanced_parens)/i);
> > +
> > +                               $id_length = 0 if ($orig_commit =~
> > /^[0-9a-f]{12}$/i);
> > +                               $id_case = 0 if ($orig_commit !~ /[A-
> > F]/);
> > +
> > +                               # Always strip leading/trailing parens
> > then double quotes if existing
> > +                               $title = substr($title, 1, -1);
> > +                               if ($title =~ /^".*"$/) {
> > +                                       $title = substr($title, 1, -
> > 1);
> > +                                       $title_has_quotes = 1;
> > +                               }
> > +                       }
> > +
> > +                       my ($cid, $ctitle) =
> > git_commit_info($orig_commit, $id,
> > +                                                            $title);
> > +
> > +                       if ($ctitle ne $title || $tag_case ||
> > $tag_space ||
> > +                           $id_length || $id_case ||
> > !$title_has_quotes) {
> > +                               if (WARN("BAD_FIXES_TAG",
> > +                                    "Please use correct Fixes: style
> > 'Fixes: <12 chars of sha1> (\"<title line>\")' - ie: 'Fixes: $cid
> > (\"$ctitle\")'\n" . $herecurr) &&
> > +                                   $fix) {
> > +                                       $fixed[$fixlinenr] = "Fixes:
> > $cid (\"$ctitle\")";
> > +                               }
> > +                       }
> > +               }
> > +
> >  # Check email subject for common tools that don't need to be
> > mentioned
> >                 if ($in_header_lines &&
> >                     $line =~
> > /^Subject:.*\b(?:checkpatch|sparse|smatch)\b[^:]/i) {
>