1 files changed, 25 insertions, 8 deletions

diff --git a/arch/arm/include/asm/processor.h b/arch/arm/include/asm/processor.h
index 413f3876341c..c3d5fc124a05 100644
--- a/arch/arm/include/asm/processor.h
+++ b/arch/arm/include/asm/processor.h
@@ -22,6 +22,7 @@
 #include <asm/hw_breakpoint.h>
 #include <asm/ptrace.h>
 #include <asm/types.h>
+#include <asm/unified.h>
 
 #ifdef __KERNEL__
 #define STACK_TOP       ((current->personality & ADDR_LIMIT_32BIT) ? \
@@ -87,6 +88,17 @@ unsigned long get_wchan(struct task_struct *p);
 #define KSTK_EIP(tsk)   task_pt_regs(tsk)->ARM_pc
 #define KSTK_ESP(tsk)   task_pt_regs(tsk)->ARM_sp
 
+#ifdef CONFIG_SMP
+#define __ALT_SMP_ASM(smp, up)                                          \
+        "9998:  " smp "\n"                                              \
+        "       .pushsection \".alt.smp.init\", \"a\"\n"                \
+        "       .long   9998b\n"                                        \
+        "       " up "\n"                                               \
+        "       .popsection\n"
+#else
+#define __ALT_SMP_ASM(smp, up)  up
+#endif
+
 /*
  * Prefetching support - only ARMv5.
  */
@@ -97,17 +109,22 @@ static inline void prefetch(const void *ptr)
 {
         __asm__ __volatile__(
                 "pld\t%a0"
-                :
-                : "p" (ptr)
-                : "cc");
+                :: "p" (ptr));
 }
 
+#if __LINUX_ARM_ARCH__ >= 7 && defined(CONFIG_SMP)
 #define ARCH_HAS_PREFETCHW
-#define prefetchw(ptr)  prefetch(ptr)
-
-#define ARCH_HAS_SPINLOCK_PREFETCH
-#define spin_lock_prefetch(x) do { } while (0)
-
+static inline void prefetchw(const void *ptr)
+{
+        __asm__ __volatile__(
+                ".arch_extension        mp\n"
+                __ALT_SMP_ASM(
+                        WASM(pldw)              "\t%a0",
+                        WASM(pld)               "\t%a0"
+                )
+                :: "p" (ptr));
+}
+#endif
 #endif
 
 #define HAVE_ARCH_PICK_MMAP_LAYOUT