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| author |   Vineet Gupta <vgupta@kernel.org> | 2019-09-09 16:59:59 -0700 |
|---|---|---|
| committer | Vineet Gupta <vgupta@kernel.org> | 2021-08-24 14:25:48 -0700 |
| commit | 12e7804c264143c63d1cae7e3a62d21fbed06f59 (patch) | |
| tree | ec23effa7dd554527280fca8040d16e8b824e196 /arch/arc/mm/tlbex.S | |
| parent | ARC: mm: use SCRATCH_DATA0 register for caching pgdir in ARCv2 only (diff) | |
| download | linux-dev-12e7804c264143c63d1cae7e3a62d21fbed06f59.tar.xz linux-dev-12e7804c264143c63d1cae7e3a62d21fbed06f59.zip | |
ARC: mm: remove tlb paranoid code
This was used back in arc700 days when ASID allocator was fragile.
Not needed in last 5 years
Signed-off-by: Vineet Gupta <vgupta@kernel.org>
Diffstat (limited to 'arch/arc/mm/tlbex.S')
| -rw-r--r-- | arch/arc/mm/tlbex.S | 50 |
1 files changed, 0 insertions, 50 deletions
diff --git a/arch/arc/mm/tlbex.S b/arch/arc/mm/tlbex.S index bcd2909c691f..0b4bb62fa0ab 100644 --- a/arch/arc/mm/tlbex.S +++ b/arch/arc/mm/tlbex.S @@ -93,11 +93,6 @@ ex_saved_reg1: st_s r1, [r0, 4] st_s r2, [r0, 8] st_s r3, [r0, 12] - - ; VERIFY if the ASID in MMU-PID Reg is same as - ; one in Linux data structures - - tlb_paranoid_check_asm .endm .macro TLBMISS_RESTORE_REGS @@ -147,51 +142,6 @@ ex_saved_reg1: #endif ;============================================================================ -; Troubleshooting Stuff -;============================================================================ - -; Linux keeps ASID (Address Space ID) in task->active_mm->context.asid -; When Creating TLB Entries, instead of doing 3 dependent loads from memory, -; we use the MMU PID Reg to get current ASID. -; In bizzare scenrios SW and HW ASID can get out-of-sync which is trouble. -; So we try to detect this in TLB Mis shandler - -.macro tlb_paranoid_check_asm - -#ifdef CONFIG_ARC_DBG_TLB_PARANOIA - - GET_CURR_TASK_ON_CPU r3 - ld r0, [r3, TASK_ACT_MM] - ld r0, [r0, MM_CTXT+MM_CTXT_ASID] - breq r0, 0, 55f ; Error if no ASID allocated - - lr r1, [ARC_REG_PID] - and r1, r1, 0xFF - - and r2, r0, 0xFF ; MMU PID bits only for comparison - breq r1, r2, 5f - -55: - ; Error if H/w and S/w ASID don't match, but NOT if in kernel mode - lr r2, [erstatus] - bbit0 r2, STATUS_U_BIT, 5f - - ; We sure are in troubled waters, Flag the error, but to do so - ; need to switch to kernel mode stack to call error routine - GET_TSK_STACK_BASE r3, sp - - ; Call printk to shoutout aloud - mov r2, 1 - j print_asid_mismatch - -5: ; ASIDs match so proceed normally - nop - -#endif - -.endm - -;============================================================================ ;TLB Miss handling Code ;============================================================================ |