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 <[email protected]> Reviewed-by: Christoph Hellwig <[email protected]> Signed-off-by: Paul Walmsley <[email protected]> (cherry picked from commit 6efb16b) Signed-off-by: Seth Forshee <[email protected]>
pop-os · Mar 19, 2020 · d015c8a · d015c8a
1 parent 05c2d02
commit d015c8a
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/arch/riscv/mm/tlbflush.c b/arch/riscv/mm/tlbflush.c
@@ -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);