GNU C Library master sources branch master updated. glibc-2.20-142-g7f981fc

[torvald at sourceware dot org]

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http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=7f981fc24a9156dba8cfe5e7eb8e87fa9d793f2a

commit 7f981fc24a9156dba8cfe5e7eb8e87fa9d793f2a
Author: Torvald Riegel <triegel@redhat.com>
Date:   Sat Oct 18 01:01:58 2014 +0200

    powerpc: Change atomic_write_barrier to have release semantics.

diff --git a/ChangeLog b/ChangeLog
index fac4138..7002206 100644
--- 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
--- 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
--- 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
--- 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

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                               |    8 ++++++++
 sysdeps/powerpc/bits/atomic.h           |    1 -
 sysdeps/powerpc/powerpc32/bits/atomic.h |    2 ++
 sysdeps/powerpc/powerpc64/bits/atomic.h |    1 +
 4 files changed, 11 insertions(+), 1 deletions(-)


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