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

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/kernel/entry.S b/arch/mips/kernel/entry.S
index a9c6de1..4575651 100644
--- a/arch/mips/kernel/entry.S
+++ b/arch/mips/kernel/entry.S
@@ -87,7 +87,7 @@
 	ori	v1, v0, TCSTATUS_IXMT
 	mtc0	v1, CP0_TCSTATUS
 	andi	v0, TCSTATUS_IXMT
-	ehb
+	_ehb
 	mfc0	t0, CP0_TCCONTEXT
 	DMT	9				# dmt t1
 	jal	mips_ihb
@@ -95,7 +95,7 @@
 	andi	t3, t0, 0xff00
 	or	t2, t2, t3
 	mtc0	t2, CP0_STATUS
-	ehb
+	_ehb
 	andi	t1, t1, VPECONTROL_TE
 	beqz	t1, 1f
 	EMT
@@ -105,7 +105,7 @@
 	xori	v1, v1, TCSTATUS_IXMT
 	or	v1, v0, v1
 	mtc0	v1, CP0_TCSTATUS
-	ehb
+	_ehb
 	xor	t0, t0, t3
 	mtc0	t0, CP0_TCCONTEXT
 #endif /* CONFIG_MIPS_MT_SMTC */