ARC: entry: move MMU specific bits out of entry code

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

Author: vineetgarc

arch/arc/kernel/entry.S

@@ -100,9 +100,6 @@ ENTRY(EV_MachineCheck)
 	lr  r0, [efa]
 	mov r1, sp
 
-	; MC excpetions disable MMU
-	ARC_MMU_REENABLE r3
-
 	lsr  	r3, r10, 8
 	bmsk 	r3, r3, 7
 	brne    r3, ECR_C_MCHK_DUP_TLB, 1f

arch/arc/mm/tlb.c

@@ -237,6 +237,9 @@ void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
 		}
 	}
 
+	/* Re-enable MMU as hardware may have auto-disabled it upon exception */
+	write_aux_reg(ARC_REG_PID, read_aux_reg(ARC_REG_PID) | MMU_ENABLE);
+
 	local_irq_restore(flags);
 }