linux-kernel - [PATCH] xattr: fix check for simultaneous glibc header inclusion

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Date:	Wed, 13 Aug 2014 16:42:23 -0700
From:	Filipe Brandenburger <filbranden@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Serge Hallyn <serge.hallyn@...ntu.com>
Cc:	Allan McRae <allan@...hlinux.org>, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org,
	Filipe Brandenburger <filbranden@...gle.com>
Subject: [PATCH] xattr: fix check for simultaneous glibc header inclusion

The guard was introduced in patch ea1a8217b06b41 ("xattr: guard against
simultaneous glibc header inclusion") but it is using #ifdef to check
for a define that is either set to 1 or 0. Fix it to use #if instead.

Signed-off-by: Filipe Brandenburger <filbranden@...gle.com>
Cc: Serge Hallyn <serge.hallyn@...ntu.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Allan McRae <allan@...hlinux.org>
Cc: <stable@...r.kernel.org>
---
 include/uapi/linux/xattr.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Tested:
* Without this patch:
  $ { echo "#include <sys/xattr.h>"; echo "#include <linux/xattr.h>"; } | gcc -E -Iinclude/uapi - >/dev/null
  include/uapi/linux/xattr.h:19:0: warning: "XATTR_CREATE" redefined [enabled by default]
   #define XATTR_CREATE 0x1 /* set value, fail if attr already exists */
   ^
  /usr/include/x86_64-linux-gnu/sys/xattr.h:32:0: note: this is the location of the previous definition
   #define XATTR_CREATE XATTR_CREATE
   ^

* With this patch:
  $ { echo "#include <sys/xattr.h>"; echo "#include <linux/xattr.h>"; } | gcc -E -Iinclude/uapi - >/dev/null
  (no warnings)

diff --git a/include/uapi/linux/xattr.h b/include/uapi/linux/xattr.h
index c38355c1f3c9..1590c49cae57 100644
--- a/include/uapi/linux/xattr.h
+++ b/include/uapi/linux/xattr.h
@@ -13,7 +13,7 @@
 #ifndef _UAPI_LINUX_XATTR_H
 #define _UAPI_LINUX_XATTR_H
 
-#ifdef __UAPI_DEF_XATTR
+#if __UAPI_DEF_XATTR
 #define __USE_KERNEL_XATTR_DEFS
 
 #define XATTR_CREATE	0x1	/* set value, fail if attr already exists */
-- 
2.1.0.rc2.206.gedb03e5

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