linux-kernel - [PATCH] checkpatch: Prefer __printf not __attribute_

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Date:	Wed, 02 Nov 2011 04:27:37 +0200
From:	Joe Perches <joe@...ches.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, Andy Whitcroft <apw@...onical.com>
Subject: [PATCH] checkpatch: Prefer __printf not
 __attribute__((format(printf,...)))

Add a warn for not using __printf.

Signed-off-by: Joe Perches <joe@...ches.com>
---
On Tue, 2011-11-01 at 15:09 -0700, Andrew Morton wrote:
> hm, we don't appear to have a checkpatch rule telling people not to use
> __attribute__((format(printf, ...))).  Who should I hassle about that? :)

Probably Andy Whitcroft.  Until he reappears though...

 scripts/checkpatch.pl |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 5e93342..6cae370 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3097,6 +3097,12 @@ sub process {
 			     "__aligned(size) is preferred over __attribute__((aligned(size)))\n" . $herecurr);
 		}
 
+# Check for __attribute__ format(printf, prefer __printf
+		if ($line =~ /\b__attribute__\s*\(\s*\(\s*format\s*\(\s*printf/) {
+			WARN("PREFER_PRINTF",
+			     "__printf(string-index, first-to-check) is preferred over __attribute__((format(printf, string-index, first-to-check)))\n" . $herecurr);
+		}
+
 # check for sizeof(&)
 		if ($line =~ /\bsizeof\s*\(\s*\&/) {
 			WARN("SIZEOF_ADDRESS",


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