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RISC-V: Issue a tlb page flush if possible 

If tlbflush request is for page only, there is no need to do a
complete local tlb shootdown.

Just do a local tlb flush for the given address.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
This commit is contained in:
Atish Patra 2019-08-22 00:51:51 -07:00 committed by Paul Walmsley
parent 31738ede9b
commit 6efb16b1d5
1 changed files with 4 additions and 1 deletions
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5
arch/riscv/mm/tlbflush.c
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@ -27,7 +27,10 @@ static void __sbi_tlb_flush_range(struct cpumask *cmask, unsigned long start,
if (cpumask_any_but(cmask, cpuid) >= nr_cpu_ids) {
/* local cpu is the only cpu present in cpumask */
local_flush_tlb_all();
if (size <= PAGE_SIZE)
local_flush_tlb_page(start);
else
local_flush_tlb_all();
} else {
riscv_cpuid_to_hartid_mask(cmask, &hmask);
sbi_remote_sfence_vma(cpumask_bits(&hmask), start, size);