From 7187dec5ca18b5af7565bcb3f1748343a422a6b4 Mon Sep 17 00:00:00 2001 From: Vineet Gupta Date: Mon, 17 Jun 2013 14:33:15 +0530 Subject: [PATCH] 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 --- arch/arc/mm/tlbex.S | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/arch/arc/mm/tlbex.S b/arch/arc/mm/tlbex.S index fcdc19ff6da7..5c5bb23001b0 100644 --- 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 ;---------------------------------------------------------------- -- 2.39.5