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-rw-r--r--arch/arm64/include/asm/barrier.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/barrier.h b/arch/arm64/include/asm/barrier.h
index 822a9192c551..f66bb04fdf2d 100644
--- a/arch/arm64/include/asm/barrier.h
+++ b/arch/arm64/include/asm/barrier.h
@@ -34,6 +34,10 @@
#define psb_csync() asm volatile("hint #17" : : : "memory")
#define csdb() asm volatile("hint #20" : : : "memory")
+#define spec_bar() asm volatile(ALTERNATIVE("dsb nsh\nisb\n", \
+ SB_BARRIER_INSN"nop\n", \
+ ARM64_HAS_SB))
+
#define mb() dsb(sy)
#define rmb() dsb(ld)
#define wmb() dsb(st)