ARC: mm: tlb flush optim: elide redundant uTLB invalidates for MMUv3 (2f4ecf68) · Commits · 戴 / test

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>

arch/arc/mm/tlb.c

+0 −5

Original line number	Diff line number	Diff line
		@@ -339,8 +339,6 @@ void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
		}
		}

		utlb_invalidate();

		local_irq_restore(flags);
		}

		@@ -369,8 +367,6 @@ void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
		start += PAGE_SIZE;
		}

		utlb_invalidate();

		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) {
		tlb_entry_erase((page & PAGE_MASK) \| hw_pid(vma->vm_mm, cpu));
		utlb_invalidate();
		}

		local_irq_restore(flags);

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