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ARC: mm: tlb flush optim: elide redundant uTLB invalidates for MMUv3

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For MMUv3 (and prior) the flush_tlb_{range,mm,page} API use the MMU
TLBWrite cmd which already nukes the entire uTLB, so NO need for
additional IVUTLB cmd from utlb_invalidate() - hence this patch

local_flush_tlb_all() is special since it uses a weaker TLBWriteNI
cmd (prec commit) to shoot down JTLB, hence we retain the explicit
uTLB flush

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Vineet Gupta 2019-09-10 15:38:10 -07:00
parent 1355ea2e60
commit 2f4ecf68a0
1 changed files with 0 additions and 5 deletions
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5
arch/arc/mm/tlb.c
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@ -339,8 +339,6 @@ void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
} }
} }
utlb_invalidate();
local_irq_restore(flags); local_irq_restore(flags);
} }
@ -369,8 +367,6 @@ void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
start += PAGE_SIZE; start += PAGE_SIZE;
} }
utlb_invalidate();
local_irq_restore(flags); local_irq_restore(flags);
} }
@ -391,7 +387,6 @@ void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
if (asid_mm(vma->vm_mm, cpu) != MM_CTXT_NO_ASID) { if (asid_mm(vma->vm_mm, cpu) != MM_CTXT_NO_ASID) {
tlb_entry_erase((page & PAGE_MASK) | hw_pid(vma->vm_mm, cpu)); tlb_entry_erase((page & PAGE_MASK) | hw_pid(vma->vm_mm, cpu));
utlb_invalidate();
} }
local_irq_restore(flags); local_irq_restore(flags);