liburcu: revert ARM GCC blacklist commit

This fixes the following error when building liburcu:
"Your gcc version produces clobbered frame accesses"

OE-Core is using a patched GCC 4.8.2 which is able to compile liburcu
properly.

(From OE-Core rev: aaf5ae09f14578ff1961ad3b199aacbc77a1f8ff)

Signed-off-by: Jonathan Liu <net147@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-support/liburcu/liburcu/Revert-Blacklist-ARM-gcc-4.8.0-4.8.1-4.8.2.patch

@@ -0,0 +1,47 @@
+From 7b3df100346128d780f218b881d563d1fd12e310 Mon Sep 17 00:00:00 2001
+From: Jonathan Liu <net147@gmail.com>
+Date: Mon, 20 Oct 2014 13:46:10 +1100
+Subject: [PATCH] Revert "Blacklist ARM gcc 4.8.0, 4.8.1, 4.8.2"
+
+This reverts commit 4b79310aa3d408ba30fee02cc497a68072d38a99.
+OE-Core is using a patched GCC 4.8.2 which is able to compile liburcu
+properly.
+
+Upstream-Status: Inappropriate [OE specific]
+
+Signed-off-by: Jonathan Liu <net147@gmail.com>
+---
+ urcu/compiler.h | 19 -------------------
+ 1 file changed, 19 deletions(-)
+
+diff --git a/urcu/compiler.h b/urcu/compiler.h
+index 1e30903..19534f0 100644
+--- a/urcu/compiler.h
++++ b/urcu/compiler.h
+@@ -108,23 +108,4 @@
+ 
+ #define CAA_ARRAY_SIZE(x)	(sizeof(x) / sizeof((x)[0]))
+ 
+-/*
+- * Don't allow compiling with buggy compiler.
+- */
+-
+-#ifdef __GNUC__
+-# define URCU_GCC_VERSION	(__GNUC__ * 10000 \
+-				+ __GNUC_MINOR__ * 100 \
+-				+ __GNUC_PATCHLEVEL__)
+-
+-/*
+- * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58854
+- */
+-# ifdef __ARMEL__
+-#  if URCU_GCC_VERSION >= 40800 && URCU_GCC_VERSION <= 40802
+-#   error Your gcc version produces clobbered frame accesses
+-#  endif
+-# endif
+-#endif
+-
+ #endif /* _URCU_COMPILER_H */
+-- 
+2.1.2
+

meta/recipes-support/liburcu/liburcu_0.8.4.bb

@@ -8,6 +8,7 @@ LIC_FILES_CHKSUM = "file://LICENSE;md5=0f060c30a27922ce9c0d557a639b4fa3 \
                     file://urcu/uatomic/x86.h;beginline=4;endline=21;md5=220552f72c55b102f2ee35929734ef42"
 
 SRC_URI = "http://lttng.org/files/urcu/userspace-rcu-${PV}.tar.bz2 \
+           file://Revert-Blacklist-ARM-gcc-4.8.0-4.8.1-4.8.2.patch \
           "
 
 SRC_URI[md5sum] = "2ca6671b20a550aa0e8020a1a9a96fd4"