From 695f54f92060210a7aa8332a30616348a0c9cdaa Mon Sep 17 00:00:00 2001
From: Alexey Dobriyan <adobriyan@gmail.com>
Date: Wed, 8 Feb 2017 10:44:09 +1100
Subject: checkpatch: warn when formats use %Z and suggest %z

vsnprintf extension %Z<foo> is non-standard C.
Suggest the use of %z instead.

Miscellanea:

o Correct the misuse of type string PRINTF_0xDECIMAL
  type strings are supposed to be uppercase only.
  Fix this and add tr/[a-z]/[A-Z] to the type check in case
  I forget this again sometime in the future.
o Improve the mechanism to find these defects so all
  3 current checks are done on the format string

Link: http://lkml.kernel.org/r/20170109235955.GA6787@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 scripts/checkpatch.pl | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 12db1483e6c2..289d61303cfc 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -5208,6 +5208,12 @@ sub process {
 				     "\%Ld/%Lu are not-standard C, use %lld/%llu\n" . $herecurr);
 				last;
 			}
+			# check for %Z
+			if ($string =~ /(?<!%)%[\*\d\.\$]*Z[diouxX]/) {
+				WARN("PRINTF_Z",
+				     "%Z is non-standard C, use %z\n" . $herecurr);
+				last;
+			}
 			if ($string =~ /0x%[\*\d\.\$\Llzth]*[udi]/) {
 				ERROR("PRINTF_0xDECIMAL",
 				      "Prefixing 0x with decimal output is defective\n" . $herecurr);
-- 
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