linux-kernel - [PATCH] checkpatch: Emit an error on formats with 0x%<decimal>

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Message-ID: <1438618534.30149.37.camel@perches.com>
Date:	Mon, 03 Aug 2015 09:15:34 -0700
From:	Joe Perches <joe@...ches.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Andy Whitcroft <apw@...onical.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] checkpatch: Emit an error on formats with 0x%<decimal>

Using 0x%d is wrong.  Emit a message when it happens.

Miscellanea:

improve the %Lu warning to match formats like %16Lu

Signed-off-by: Joe Perches <joe@...ches.com>
---
 scripts/checkpatch.pl | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 50693f5..e367eab 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -4816,16 +4816,20 @@ sub process {
                             "Consecutive strings are generally better as a single string\n" . $herecurr);
                }
 
-# check for %L{u,d,i} in strings
+# check for %L{u,d,i} and 0x%[udi] in strings
                my $string;
                while ($line =~ /(?:^|")([X\t]*)(?:"|$)/g) {
                        $string = substr($rawline, $-[1], $+[1] - $-[1]);
                        $string =~ s/%%/__/g;
-                       if ($string =~ /(?<!%)%L[udi]/) {
+                       if ($string =~ /(?<!%)%[\*\d\.\$]*L[udi]/) {
                                WARN("PRINTF_L",
                                     "\%Ld/%Lu are not-standard C, use %lld/%llu\n" . $herecurr);
                                last;
                        }
+                       if ($string =~ /0x%[\*\d\.\$\Llzth]*[udi]/) {
+                               ERROR("PRINTF_0xDECIMAL",
+                                     "Prefixing 0x with decimal output is defective\n" . $herecurr);
+                       }
                }
 
 # check for line continuations in quoted strings with odd counts of "
--
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