[PATCH v1] checkpatch: test missing initial blank line in block comment

[Hugues Fruchet <hugues.fruchet@st.com>]

Warn when block comments are not starting with blank comment:

/* multiple lines
 * block comment,
 * => warning
 */

/*
 * multiple lines
 * block comment,
 * => no warning
 */

Exception made for networking files where rule is the
exact opposite.

Signed-off-by: Hugues Fruchet <hugues.fruchet@st.com>
---
 scripts/checkpatch.pl | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index baa3c7b..8754c9d 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3000,6 +3000,17 @@ sub process {
 			     "networking block comments don't use an empty /* line, use /* Comment...\n" . $hereprev);
 		}
 
+# Block comment styles
+# Missing initial /*
+		if ($realfile !~ m@^(drivers/net/|net/)@ &&	#networking exception
+		    $prevrawline =~ /^\+[ \t]\/\**.+[ \t]/ &&	#start with /*...
+		    $prevrawline !~ /^\+.*\/\*.*\*\/[ \t]*/ &&	#no inline /*...*/
+		    $rawline =~ /^\+[ \t]*\*/ &&
+		    $realline > 2) {
+			WARN("BLOCK_COMMENT_STYLE",
+			     "Block comments starts with an empty /*\n" . $hereprev);
+		}
+
 # Block comments use * on subsequent lines
 		if ($prevline =~ /$;[ \t]*$/ &&			#ends in comment
 		    $prevrawline =~ /^\+.*?\/\*/ &&		#starting /*
-- 
1.9.1