linux-kernel - [PATCH] scripts/checkpatch.pl: Change long line warning to 105 chars

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Date:	Thu, 17 Dec 2009 21:12:24 -0800
From:	Joe Perches <joe@...ches.com>
To:	Valdis.Kletnieks@...edu, Andy Whitcroft <apw@...onical.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mikulas Patocka <mpatocka@...hat.com>,
	Krzysztof Halasa <khc@...waw.pl>,
	Paul Mundt <lethal@...ux-sh.org>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Alasdair G Kergon <agk@...hat.com>, dm-devel@...hat.com
Subject: [PATCH] scripts/checkpatch.pl: Change long line warning to 105
 chars

On Thu, 2009-12-17 at 23:29 -0500, Valdis.Kletnieks@...edu wrote:
> Yeah, but I respectfully submit that if the regexp '^\t{6}' matches a non-
> continuation line, it's probably in its rights to whinge. 
> 	grep -r -P '^\t{7:}(?!(.*,$|.*\);$))' . | more
> produces a whole lot of "this can't end well" output.

I think this is a good test to add to checkpatch.

Add 105 character long line WARN test
Add 80 character long line STRICT test
Add 6+ leading indent tabs test, consider restructuring

Signed-off-by: Joe Perches <joe@...ches.com>

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index bc4114f..c358251 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -1374,13 +1374,20 @@ sub process {
 # check we are in a valid source file if not then ignore this hunk
 		next if ($realfile !~ /\.(h|c|s|S|pl|sh)$/);
 
-#80 column limit
+#Line too long
 		if ($line =~ /^\+/ && $prevrawline !~ /\/\*\*/ &&
 		    $rawline !~ /^.\s*\*\s*\@$Ident\s/ &&
-		    $line !~ /^\+\s*printk\s*\(\s*(?:KERN_\S+\s*)?"[X\t]*"\s*(?:,|\)\s*;)\s*$/ &&
-		    $length > 80)
-		{
-			WARN("line over 80 characters\n" . $herecurr);
+		    $line !~ /^\+\s*printk\s*\(\s*(?:KERN_\S+\s*)?"[X\t]*"\s*(?:,|\)\s*;)\s*$/) {
+			if ($length > 105) {
+				WARN("line over 105 characters\n" . $herecurr);
+			} elsif ($length > 80) {
+				CHK("line over 80 characters\n" . $herecurr);
+			}
+		}
+
+#too many leading tabs - deep leading indent
+		if ($line =~ /^\+	{6,}(?!(.*,$|.*\);$))/) {
+			CHK("Too many leading tabs.  Consider restructuring code\n" . $herecurr);
 		}
 
 # check for adding lines without a newline.


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