1 files changed, 10 insertions, 0 deletions

diff --git a/arch/x86/um/asm/processor.h b/arch/x86/um/asm/processor.h
index 2c32df6fe231..04f82e020f2b 100644
--- a/arch/x86/um/asm/processor.h
+++ b/arch/x86/um/asm/processor.h
@@ -17,6 +17,16 @@
 #define ARCH_IS_STACKGROW(address) \
        (address + 65536 + 32 * sizeof(unsigned long) >= UPT_SP(&current->thread.regs.regs))
 
+#include <asm/user.h>
+
+/* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
+static inline void rep_nop(void)
+{
+        __asm__ __volatile__("rep;nop": : :"memory");
+}
+
+#define cpu_relax()     rep_nop()
+
 #include <asm/processor-generic.h>
 
 #endif