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- From 946d1cadf0bb54216409e8e0eb09be3e96044dbf 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 f24f1c71ed..574487ca54 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"
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