ARC: [tlb-miss] Fix bug with CONFIG_ARC_DBG_TLB_MISS_COUNT

LOAD_FAULT_PTE macro is expected to set r2 with faulting vaddr.
However in case of CONFIG_ARC_DBG_TLB_MISS_COUNT, it was getting
clobbered with statistics collection code.

Fix latter by using a different register.

Note that only I-TLB Miss handler was potentially affected.

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

diff --git a/arch/arc/mm/tlbex.S b/arch/arc/mm/tlbex.S
index fcdc19ff6da7746d9b32e7a6a7718d4f57820653..5c5bb23001b071b02a0ea33dba44d72211656d28 100644 (file)
--- a/arch/arc/mm/tlbex.S
+++ b/arch/arc/mm/tlbex.S
@@ -147,9 +147,9 @@ ex_saved_reg1:
 #ifdef CONFIG_ARC_DBG_TLB_MISS_COUNT
        and.f 0, r0, _PAGE_PRESENT
        bz   1f
-       ld   r2, [num_pte_not_present]
-       add  r2, r2, 1
-       st   r2, [num_pte_not_present]
+       ld   r3, [num_pte_not_present]
+       add  r3, r3, 1
+       st   r3, [num_pte_not_present]
 1:
 #endif
 
@@ -271,7 +271,7 @@ ARC_ENTRY EV_TLBMissI
 #endif
 
        ;----------------------------------------------------------------
-       ; Get the PTE corresponding to V-addr accessed
+       ; Get the PTE corresponding to V-addr accessed, r2 is setup with EFA
        LOAD_FAULT_PTE
 
        ;----------------------------------------------------------------
@@ -311,7 +311,7 @@ ARC_ENTRY EV_TLBMissD
 
        ;----------------------------------------------------------------
        ; Get the PTE corresponding to V-addr accessed
-       ; If PTE exists, it will setup, r0 = PTE, r1 = Ptr to PTE
+       ; If PTE exists, it will setup, r0 = PTE, r1 = Ptr to PTE, r2 = EFA
        LOAD_FAULT_PTE
 
        ;----------------------------------------------------------------