[MIPS] Cleanup memory barriers for weakly ordered systems.

Also the R4000 / R4600 LL/SC instructions imply a sync so no explicit sync
needed.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 12 insertions, 10 deletions

diff --git a/include/asm-mips/futex.h b/include/asm-mips/futex.h
index ed023eae0674..927a216bd530 100644
--- a/include/asm-mips/futex.h
+++ b/include/asm-mips/futex.h
@@ -1,19 +1,21 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 2006  Ralf Baechle (ralf@linux-mips.org)
+ */
 #ifndef _ASM_FUTEX_H
 #define _ASM_FUTEX_H
 
 #ifdef __KERNEL__
 
 #include <linux/futex.h>
+#include <asm/barrier.h>
 #include <asm/errno.h>
 #include <asm/uaccess.h>
 #include <asm/war.h>
 
-#ifdef CONFIG_SMP
-#define __FUTEX_SMP_SYNC "      sync                                    \n"
-#else
-#define __FUTEX_SMP_SYNC
-#endif
-
 #define __futex_atomic_op(insn, ret, oldval, uaddr, oparg)              \
 {                                                                       \
         if (cpu_has_llsc && R10000_LLSC_WAR) {                          \
@@ -27,7 +29,7 @@
                 "       .set    mips3                           \n"     \
                 "2:     sc      $1, %2                          \n"     \
                 "       beqzl   $1, 1b                          \n"     \
-                __FUTEX_SMP_SYNC                                        \
+                __WEAK_ORDERING_MB                                      \
                 "3:                                             \n"     \
                 "       .set    pop                             \n"     \
                 "       .set    mips0                           \n"     \
@@ -53,7 +55,7 @@
                 "       .set    mips3                           \n"     \
                 "2:     sc      $1, %2                          \n"     \
                 "       beqz    $1, 1b                          \n"     \
-                __FUTEX_SMP_SYNC                                        \
+                __WEAK_ORDERING_MB                                      \
                 "3:                                             \n"     \
                 "       .set    pop                             \n"     \
                 "       .set    mips0                           \n"     \
@@ -150,7 +152,7 @@ futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
                 "       .set    mips3                                   \n"
                 "2:     sc      $1, %1                                  \n"
                 "       beqzl   $1, 1b                                  \n"
-                __FUTEX_SMP_SYNC
+                __WEAK_ORDERING_MB
                 "3:                                                     \n"
                 "       .set    pop                                     \n"
                 "       .section .fixup,\"ax\"                          \n"
@@ -177,7 +179,7 @@ futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
                 "       .set    mips3                                   \n"
                 "2:     sc      $1, %1                                  \n"
                 "       beqz    $1, 1b                                  \n"
-                __FUTEX_SMP_SYNC
+                __WEAK_ORDERING_MB
                 "3:                                                     \n"
                 "       .set    pop                                     \n"
                 "       .section .fixup,\"ax\"                          \n"