From b30f380cd88ae181a4a6a3a4784206ffe3ccd19b Mon Sep 17 00:00:00 2001
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From: Khem Raj <raj.khem@gmail.com>
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Date: Thu, 31 Dec 2015 14:35:35 -0800
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Subject: [PATCH] nativesdk-glibc: Allow 64 bit atomics for x86
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The fix consist of allowing 64bit atomic ops for x86.
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This should be safe for i586 and newer CPUs.
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It also makes the synchronization more efficient.
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Upstream-Status: Inappropriate [OE-Specific]
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Signed-off-by: Juro Bystricky <juro.bystricky@intel.com>
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Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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Signed-off-by: Khem Raj <raj.khem@gmail.com>
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---
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sysdeps/x86/atomic-machine.h | 3 +--
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1 file changed, 1 insertion(+), 2 deletions(-)
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diff --git a/sysdeps/x86/atomic-machine.h b/sysdeps/x86/atomic-machine.h
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index 695222e4fa..9d39bfdbd5 100644
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--- a/sysdeps/x86/atomic-machine.h
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+++ b/sysdeps/x86/atomic-machine.h
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@@ -52,15 +52,14 @@ typedef uintmax_t uatomic_max_t;
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#define LOCK_PREFIX "lock;"
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#define USE_ATOMIC_COMPILER_BUILTINS 1
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+# define __HAVE_64B_ATOMICS 1
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#ifdef __x86_64__
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-# define __HAVE_64B_ATOMICS 1
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# define SP_REG "rsp"
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# define SEG_REG "fs"
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# define BR_CONSTRAINT "q"
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# define IBR_CONSTRAINT "iq"
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#else
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-# define __HAVE_64B_ATOMICS 0
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# define SP_REG "esp"
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# define SEG_REG "gs"
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# define BR_CONSTRAINT "r"
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