[MIPS] Fix use of ehb instruction for non-R2 configurations.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/include/asm-mips/mipsregs.h b/include/asm-mips/mipsregs.h
index 6739779..9192d76 100644
--- a/include/asm-mips/mipsregs.h
+++ b/include/asm-mips/mipsregs.h
@@ -1459,7 +1459,8 @@
 static inline void __ehb(void)
 {
 	__asm__ __volatile__(
-	"	ehb							\n");
+	"	.set	mips32r2					\n"
+	"	ehb							\n"		"	.set	mips0						\n");
 }
 
 /*