Re: [PATCH v10] staging: fbtft: add tearing signal detect

[Joe Perches <joe@perches.com>]

> Comments are the exception to the "no spaces at the start of a line"
> rule.  I was expecting that the kbuild-bot would send a Smatch warning
> for inconsistent indenting, but comments are not counted there either.
> 
> I'm sort of surprised that we don't have checkpatch rule about the
> missing space characters.  It should be: "/* Tearing Effect Line On */".

Maybe this but the "preceded by a tab" test is pretty noisy.

---
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 4f8494527139..72347e82d384 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3720,6 +3720,22 @@ sub process {
 				    s/(\(\s*$Type\s*\))[ \t]+/$1/;
 			}
 		}
+
+# Comment styles
+# Initial comment only lines that have a leading space
+		if ($rawline =~ m{^\+([ \t]+)(?:/\*|//)} && $1 =~ / /) {
+			WARN("COMMENT_STYLE",
+			     "Initial comment lines should be indented only with tabs\n" . $herecurr);
+# comments not aligned on tabs
+		} elsif ($rawline !~ m{^\+(?:/\*|//)} &&
+			 $rawline =~ m{^\+.*[^\t](?:/\*|//)}) {
+			CHK("COMMENT_STYLE",
+			    "Comments should generally be preceded by a tab\n" . $herecurr);
+		}
+
+# comment initiators should generally be followed by a space if using words
+		if ($rawline =~ m{^\+.*(?:/\*|//)\w}) {
+			WARN("COMMENT_STYLE",
+			     "Comment text should use a space after the comment initiator\n" . $herecurr);
+		}
 
 # Block comment styles
 # Networking with an initial /*