linux-kernel - [PATCH] checkpatch: Add line-length options, set default to 100

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Date:	Sun, 05 Feb 2012 11:01:29 -0800
From:	Joe Perches <joe@...ches.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Pekka Enberg <penberg@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andy Whitcroft <apw@...dowen.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	linux-kernel@...r.kernel.org,
	Pavel Emelyanov <xemul@...allels.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Kees Cook <keescook@...omium.org>, Tejun Heo <tj@...nel.org>,
	Andrew Vagin <avagin@...nvz.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Glauber Costa <glommer@...allels.com>,
	Matt Helsley <matthltc@...ibm.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Vasiliy Kulikov <segoon@...nwall.com>, Valdis.Kletnieks@...edu
Subject: [PATCH] checkpatch: Add line-length options, set default to 100

80 column line lengths can be a bit constraining.

Make the default 100 and still emit a warning
when that length is exceeded.

When option --strict is set, emit a check when
the length is > 80 too.

Add a command line option --line-length to set
the standard line length allowed.

Using command line option --ignore=LINE_LENGTH
will not emit any line-length messages.

Adding a .checkpatch.conf file with appropriate
command line options would also avoid line-length
messages.

Signed-off-by: Joe Perches <joe@...ches.com>
---
 scripts/checkpatch.pl |   21 +++++++++++++++------
 1 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 2b52aeb..6923270 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -34,6 +34,9 @@ my @ignore = ();
 my $help = 0;
 my $configuration_file = ".checkpatch.conf";
 
+my $max_line_length_warn = 100;		# normal cases
+my $max_line_length_strict = 80;	# when using --strict
+
 sub help {
 	my ($exitcode) = @_;
 
@@ -50,6 +53,7 @@ Options:
   --terse                    one line per report
   -f, --file                 treat FILE as regular source file
   --subjective, --strict     enable more subjective tests
+  --line-length=val          set line length to emit a warning when exceeded
   --ignore TYPE(,TYPE2...)   ignore various comma separated message types
   --show-types               show the message "types" in the output
   --root=PATH                PATH to the kernel tree root
@@ -105,6 +109,7 @@ GetOptions(
 	'f|file!'	=> \$file,
 	'subjective!'	=> \$check,
 	'strict!'	=> \$check,
+	'line-length=i'	=> \$max_line_length_warn,
 	'ignore=s'	=> \@ignore,
 	'show-types!'	=> \$show_types,
 	'root=s'	=> \$root,
@@ -1726,15 +1731,19 @@ 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
+# check line length limits
 		if ($line =~ /^\+/ && $prevrawline !~ /\/\*\*/ &&
 		    $rawline !~ /^.\s*\*\s*\@$Ident\s/ &&
 		    !($line =~ /^\+\s*$logFunctions\s*\(\s*(?:(KERN_\S+\s*|[^"]*))?"[X\t]*"\s*(?:|,|\)\s*;)\s*$/ ||
-		    $line =~ /^\+\s*"[^"]*"\s*(?:\s*|,|\)\s*;)\s*$/) &&
-		    $length > 80)
-		{
-			WARN("LONG_LINE",
-			     "line over 80 characters\n" . $herecurr);
+		    $line =~ /^\+\s*"[^"]*"\s*(?:\s*|,|\)\s*;)\s*$/)) {
+			if ($length > $max_line_length_strict) {
+				CHK("LONG_LINE",
+				    "line longer than $max_line_length_strict characters\n" . $herecurr);
+			}
+			if ($length > $max_line_length_warn) {
+				WARN("LONG_LINE",
+				     "line longer than $max_line_length_warn characters\n" . $herecurr);
+			}
 		}
 
 # check for spaces before a quoted newline


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