ARC: mm: TLB Miss optim: avoid re-reading ECR

For setting PTE Dirty bit, reuse the prior test for ST miss.

No need to reload ECR and test for ST cause code as the prev
condition code is still valid (uncloberred)

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

diff --git a/arch/arc/mm/tlbex.S b/arch/arc/mm/tlbex.S
index 110c725..4c88148 100644 (file)
--- a/arch/arc/mm/tlbex.S
+++ b/arch/arc/mm/tlbex.S
@@ -380,9 +380,7 @@ ENTRY(EV_TLBMissD)
 
        ;----------------------------------------------------------------
        ; UPDATE_PTE: Let Linux VM know that page was accessed/dirty
-       lr      r3, [ecr]
        or      r0, r0, _PAGE_ACCESSED        ; Accessed bit always
-       btst_s  r3,  ECR_C_BIT_DTLB_ST_MISS   ; See if it was a Write Access ?
        or.nz   r0, r0, _PAGE_DIRTY           ; if Write, set Dirty bit as well
        st_s    r0, [r1]                      ; Write back PTE