powerpc: Change atomic_write_barrier to have release semantics.

diff --git a/ChangeLog b/ChangeLog
index fac4138..7002206 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2014-10-31  Torvald Riegel  <triegel@redhat.com>
+
+       * sysdeps/powerpc/bits/atomic.h (atomic_write_barrier): Remove and...
+       * sysdeps/powerpc/powerpc32/bits/atomic.h (atomic_write_barrier):
+       ... add here and use lwsync or sync ...
+       * sysdeps/powerpc/powerpc64/bits/atomic.h (atomic_write_barrier):
+       ... and add here using lwsync.
+
 2014-10-31  Matthew Fortune  <matthew.fortune@imgtec.com>
 
        * elf/dl-machine-reject-phdr.h: New file.

diff --git a/sysdeps/powerpc/bits/atomic.h b/sysdeps/powerpc/bits/atomic.h
index 2ffba48..f312676 100644 (file)
--- a/sysdeps/powerpc/bits/atomic.h
+++ b/sysdeps/powerpc/bits/atomic.h
@@ -77,7 +77,6 @@ typedef uintmax_t uatomic_max_t;
 #endif
 
 #define atomic_full_barrier()  __asm ("sync" ::: "memory")
-#define atomic_write_barrier() __asm ("eieio" ::: "memory")
 
 #define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval)          \
   ({                                                                         \

diff --git a/sysdeps/powerpc/powerpc32/bits/atomic.h b/sysdeps/powerpc/powerpc32/bits/atomic.h
index 7613bdc..a3dd09c 100644 (file)
--- a/sysdeps/powerpc/powerpc32/bits/atomic.h
+++ b/sysdeps/powerpc/powerpc32/bits/atomic.h
@@ -117,6 +117,7 @@
 # ifndef UP
 #  define __ARCH_REL_INSTR     "lwsync"
 # endif
+# define atomic_write_barrier()        __asm ("lwsync" ::: "memory")
 #else
 /*
  * Older powerpc32 processors don't support the new "light weight"
@@ -124,6 +125,7 @@
  * for all powerpc32 applications.
  */
 # define atomic_read_barrier() __asm ("sync" ::: "memory")
+# define atomic_write_barrier()        __asm ("sync" ::: "memory")
 #endif
 
 /*

diff --git a/sysdeps/powerpc/powerpc64/bits/atomic.h b/sysdeps/powerpc/powerpc64/bits/atomic.h
index 527fe7c..ed26b72 100644 (file)
--- a/sysdeps/powerpc/powerpc64/bits/atomic.h
+++ b/sysdeps/powerpc/powerpc64/bits/atomic.h
@@ -234,6 +234,7 @@
 #ifndef UP
 # define __ARCH_REL_INSTR      "lwsync"
 #endif
+#define atomic_write_barrier() __asm ("lwsync" ::: "memory")
 
 /*
  * Include the rest of the atomic ops macros which are common to both