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From a752857cc342ee5136c9a593037b6ee6ff8af8ee 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] 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 bb49648374..aa08d3c0a7 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"
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