1 files changed, 25 insertions, 2 deletions

diff --git a/arch/arm/include/asm/assembler.h b/arch/arm/include/asm/assembler.h
index 6e8f05c8a1c8..062b58c029ab 100644
--- a/arch/arm/include/asm/assembler.h
+++ b/arch/arm/include/asm/assembler.h
@@ -154,16 +154,39 @@
         .long   9999b,9001f;                    \
         .popsection
 
+#ifdef CONFIG_SMP
+#define ALT_SMP(instr...)                                       \
+9998:   instr
+#define ALT_UP(instr...)                                        \
+        .pushsection ".alt.smp.init", "a"                       ;\
+        .long   9998b                                           ;\
+        instr                                                   ;\
+        .popsection
+#define ALT_UP_B(label)                                 \
+        .equ    up_b_offset, label - 9998b                      ;\
+        .pushsection ".alt.smp.init", "a"                       ;\
+        .long   9998b                                           ;\
+        b       . + up_b_offset                                 ;\
+        .popsection
+#else
+#define ALT_SMP(instr...)
+#define ALT_UP(instr...) instr
+#define ALT_UP_B(label) b label
+#endif
+
 /*
  * SMP data memory barrier
  */
         .macro  smp_dmb
 #ifdef CONFIG_SMP
 #if __LINUX_ARM_ARCH__ >= 7
-        dmb
+        ALT_SMP(dmb)
 #elif __LINUX_ARM_ARCH__ == 6
-        mcr     p15, 0, r0, c7, c10, 5  @ dmb
+        ALT_SMP(mcr     p15, 0, r0, c7, c10, 5) @ dmb
+#else
+#error Incompatible SMP platform
 #endif
+        ALT_UP(nop)
 #endif
         .endm