Subject: gc ppc64le force AO load
From: Michel Normand <normand@linux.vnet.ibm.com>

Force AO_load() to map to AO_load_acquire() for powerpc.  The
AO_load_acquire() function includes isync instructions that
are critical for proper behavior on power system.

Signed-Off-By: Will Schmidt <will_schmidt at vnet.ibm.com>
Signed-off-by: Michel Normand <normand@linux.vnet.ibm.com>

diff -up libatomic_ops-7.4.4/src/atomic_ops/sysdeps/gcc/powerpc.h.gc_ppc64le_force_AO_load libatomic_ops-7.4.4/src/atomic_ops/sysdeps/gcc/powerpc.h
--- libatomic_ops-7.4.4/src/atomic_ops/sysdeps/gcc/powerpc.h.gc_ppc64le_force_AO_load	2016-05-24 15:01:55.000000000 -0500
+++ libatomic_ops-7.4.4/src/atomic_ops/sysdeps/gcc/powerpc.h	2016-06-17 10:27:10.503593018 -0500
@@ -29,6 +29,8 @@
 
 #include "../all_aligned_atomic_load_store.h"
 
+#define AO_load(addr) AO_load_acquire(addr)
+
 #include "../test_and_set_t_is_ao_t.h"
         /* There seems to be no byte equivalent of lwarx, so this       */
         /* may really be what we want, at least in the 32-bit case.     */