checkpatch: add check for too short Kconfig descriptions

I've seen various new Kconfigs with rather unhelpful one liner
descriptions.  Add a Kconfig warning for a minimum length of the Kconfig
help section.

Right now I arbitarily chose 4. The exact value can be debated.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Cc: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 15 insertions, 0 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index f2bbea900700..de0f4672cb74 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -1382,6 +1382,21 @@ sub process {
                         ERROR("trailing whitespace\n" . $herevet);
                 }
 
+# check for Kconfig help text having a real description
+                if ($realfile =~ /Kconfig/ &&
+                    $line =~ /\+?\s*(---)?help(---)?$/) {
+                        my $length = 0;
+                        for (my $l = $linenr; defined($lines[$l]); $l++) {
+                                my $f = $lines[$l];
+                                $f =~ s/#.*//;
+                                $f =~ s/^\s+//;
+                                next if ($f =~ /^$/);
+                                last if ($f =~ /^\s*config\s/);
+                                $length++;
+                        }
+                        WARN("please write a paragraph that describes the config symbol fully\n" . $herecurr) if ($length < 4);
+                }
+
 # check we are in a valid source file if not then ignore this hunk
                 next if ($realfile !~ /\.(h|c|s|S|pl|sh)$/);