linux-kernel - [PATCH] checkpatch: Test multiple line block comment alignment

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Message-Id: <edb57bd330adfe024b95ec2a807d4aa7f0c8b112.1472261299.git.joe@perches.com>
Date:   Fri, 26 Aug 2016 18:29:43 -0700
From:   Joe Perches <joe@...ches.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Andy Whitcroft <apw@...onical.com>
Cc:     Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] checkpatch: Test multiple line block comment alignment

Warn when block comments are not aligned on the *

/*
 * block comment, no warning
 */

/*
  * block comment, emit warning
  */

Reported-by: Sudip Mukherjee <sudipm.mukherjee@...il.com>
Signed-off-by: Joe Perches <joe@...ches.com>
---
 scripts/checkpatch.pl | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 4de3cc4..a16e0e2 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2939,6 +2939,25 @@ sub process {
 			     "Block comments use a trailing */ on a separate line\n" . $herecurr);
 		}
 
+# Block comment * alignment
+		if ($prevline =~ /$;[ \t]*$/ &&			#ends in comment
+		    (($prevrawline =~ /^\+.*?\/\*/ &&		#starting /*
+		      $prevrawline !~ /\*\/[ \t]*$/) ||		#no trailing */
+		     $prevrawline =~ /^\+[ \t]*\*/) &&		#starting *
+		    $rawline =~ /^\+[ \t]*\*/) {		#rawline *
+			$prevrawline =~ m@^\+([ \t]*/?)\*@;
+			my $oldindent = expand_tabs($1);
+			$rawline =~ m@^\+([ \t]*)\*@;
+			my $newindent = $1;
+			my $test_comment = '^\\+' . "$;" x (length($newindent) + 1);
+			$newindent = expand_tabs($newindent);
+			if ($line =~ /$test_comment/ &&
+			    length($oldindent) ne length($newindent)) {
+				WARN("BLOCK_COMMENT_STYLE",
+				     "Block comments should align the * on each line\n" . $hereprev);
+			}
+		}
+
 # check for missing blank lines after struct/union declarations
 # with exceptions for various attributes and macros
 		if ($prevline =~ /^[\+ ]};?\s*$/ &&
-- 
2.8.0.rc4.16.g56331f8