checkpatch: add --list-types to show message types to show or ignore

The message types are not currently knowable without reading the code.
Add a mechanism to see what they are.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index f09c3f2..c5a3c95 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -33,6 +33,7 @@ my $summary = 1;
 my $mailback = 0;
 my $summary_file = 0;
 my $show_types = 0;
+my $list_types = 0;
 my $fix = 0;
 my $fix_inplace = 0;
 my $root;
@@ -70,11 +71,12 @@ Options:
   --showfile                 emit diffed file position, not input file position
   -f, --file                 treat FILE as regular source file
   --subjective, --strict     enable more subjective tests
+  --list-types               list the possible message types
   --types TYPE(,TYPE2...)    show only these comma separated message types
   --ignore TYPE(,TYPE2...)   ignore various comma separated message types
+  --show-types               show the specific message type in the output
   --max-line-length=n        set the maximum line length, if exceeded, warn
   --min-conf-desc-length=n   set the min description length, if shorter, warn
-  --show-types               show the message "types" in the output
   --root=PATH                PATH to the kernel tree root
   --no-summary               suppress the per-file summary
   --mailback                 only produce a report in case of warnings/errors
@@ -106,6 +108,37 @@ EOM
        exit($exitcode);
 }
 
+sub uniq {
+       my %seen;
+       return grep { !$seen{$_}++ } @_;
+}
+
+sub list_types {
+       my ($exitcode) = @_;
+
+       my $count = 0;
+
+       local $/ = undef;
+
+       open(my $script, '<', abs_path($P)) or
+           die "$P: Can't read '$P' $!\n";
+
+       my $text = <$script>;
+       close($script);
+
+       my @types = ();
+       for ($text =~ /\b(?:(?:CHK|WARN|ERROR)\s*\(\s*"([^"]+)")/g) {
+               push (@types, $_);
+       }
+       @types = sort(uniq(@types));
+       print("#\tMessage type\n\n");
+       foreach my $type (@types) {
+               print(++$count . "\t" . $type . "\n");
+       }
+
+       exit($exitcode);
+}
+
 my $conf = which_conf($configuration_file);
 if (-f $conf) {
        my @conf_args;
@@ -146,6 +179,7 @@ GetOptions(
        'ignore=s'      => \@ignore,
        'types=s'       => \@use,
        'show-types!'   => \$show_types,
+       'list-types!'   => \$list_types,
        'max-line-length=i' => \$max_line_length,
        'min-conf-desc-length=i' => \$min_conf_desc_length,
        'root=s'        => \$root,
@@ -166,6 +200,8 @@ GetOptions(
 
 help(0) if ($help);
 
+list_types(0) if ($list_types);
+
 $fix = 1 if ($fix_inplace);
 $check_orig = $check;