poky/meta/recipes-core/glibc/glibc/0004-nativesdk-glibc-Allow-64-bit-atomics-for-x86.patch

From ff0f4756f1a98202726c65745aca38354864e033 Mon Sep 17 00:00:00 2001
From: Khem Raj <raj.khem@gmail.com>
Date: Thu, 31 Dec 2015 14:35:35 -0800
Subject: [PATCH 04/30] nativesdk-glibc: Allow 64 bit atomics for x86

The fix consist of allowing 64bit atomic ops for x86.
This should be safe for i586 and newer CPUs.
It also makes the synchronization more efficient.

Upstream-Status: Inappropriate [OE-Specific]

Signed-off-by: Juro Bystricky <juro.bystricky@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
 sysdeps/x86/atomic-machine.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/sysdeps/x86/atomic-machine.h b/sysdeps/x86/atomic-machine.h
index aa60ca4cd6..3e42e00183 100644
--- a/sysdeps/x86/atomic-machine.h
+++ b/sysdeps/x86/atomic-machine.h
@@ -58,15 +58,14 @@ typedef uintmax_t uatomic_max_t;
 #endif
 
 #define USE_ATOMIC_COMPILER_BUILTINS	1
+# define __HAVE_64B_ATOMICS		1
 
 #ifdef __x86_64__
-# define __HAVE_64B_ATOMICS		1
 # define SP_REG				"rsp"
 # define SEG_REG			"fs"
 # define BR_CONSTRAINT			"q"
 # define IBR_CONSTRAINT			"iq"
 #else
-# define __HAVE_64B_ATOMICS		0
 # define SP_REG				"esp"
 # define SEG_REG			"gs"
 # define BR_CONSTRAINT			"r"
-- 
2.20.1