linux-kernel - Re: [RFC PATCH] seq_file: Use seq_puts when seq

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Message-ID: <1363455766.2023.36.camel@joe-AO722>
Date:	Sat, 16 Mar 2013 10:42:46 -0700
From:	Joe Perches <joe@...ches.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] seq_file: Use seq_puts when seq_printf has only a
 format with no args

On Sat, 2013-03-16 at 09:43 -0600, Bjorn Helgaas wrote:
> Checkpatch could look for additions of seq_printf() with constant formats.

Suggested-by: Bjorn Helgaas <bhelgaas@...gle.com>
Signed-off-by: Joe Perches <joe@...ches.com>
---

I don't know what perl version introduced $-[0] and $+[0]
so this may not work with older perl.

 scripts/checkpatch.pl | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index b28cc38..e5b50c5 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -628,6 +628,13 @@ sub sanitise_line {
 	return $res;
 }
 
+sub get_quoted_string {
+	my ($line, $rawline) = @_;
+
+	return "" if ($line !~ m/(\"[X]+\")/g);
+	return substr($rawline, $-[0], $+[0] - $-[0]);
+}
+
 sub ctx_statement_block {
 	my ($linenr, $remain, $off) = @_;
 	my $line = $linenr - 1;
@@ -3372,6 +3379,15 @@ sub process {
 			     "struct spinlock should be spinlock_t\n" . $herecurr);
 		}
 
+# check for seq_printf uses that could be seq_puts
+		if ($line =~ /\bseq_printf\s*\(/) {
+			my $fmt = get_quoted_string($line, $rawline);
+			if ($fmt !~ /[^\\]\%/) {
+				WARN("PREFER_SEQ_PUTS",
+				     "Prefer seq_puts to seq_printf\n" . $herecurr);
+			}
+		}
+
 # Check for misused memsets
 		if ($^V && $^V ge 5.10.0 &&
 		    defined $stat &&


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