1 files changed, 43 insertions, 0 deletions
diff --git a/meta/recipes-core/glibc/glibc/0006-nativesdk-glibc-Allow-64-bit-atomics-for-x86.patch b/meta/recipes-core/glibc/glibc/0006-nativesdk-glibc-Allow-64-bit-atomics-for-x86.patch
new file mode 100644
index 0000000000..b0e3dbfa8a
--- /dev/null
+++ b/meta/recipes-core/glibc/glibc/0006-nativesdk-glibc-Allow-64-bit-atomics-for-x86.patch
@@ -0,0 +1,43 @@
+From a9795b9aadcbc04ad0404badf722acb83ef0ab7b 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 | 7 +------
+ 1 file changed, 1 insertion(+), 6 deletions(-)
+
+diff --git a/sysdeps/x86/atomic-machine.h b/sysdeps/x86/atomic-machine.h
+index 95663099e4..4d81efc51a 100644
+--- a/sysdeps/x86/atomic-machine.h
++++ b/sysdeps/x86/atomic-machine.h
+@@ -26,19 +26,14 @@
+ #define LOCK_PREFIX "lock;"
+ 
+ #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
+-/* Since the Pentium, i386 CPUs have supported 64-bit atomics, but the
+-   i386 psABI supplement provides only 4-byte alignment for uint64_t
+-   inside structs, so it is currently not possible to use 64-bit
+-   atomics on this platform.  */
+-# define __HAVE_64B_ATOMICS		0
+ # define SP_REG				"esp"
+ # define SEG_REG			"gs"
+ # define BR_CONSTRAINT			"r"