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>

diff --git a/arch/riscv/mm/tlbflush.c b/arch/riscv/mm/tlbflush.c
index 3531d464732323bb6a7deb3b5845589347d9855d..720b443c4528f7b2a0d141b8d480c6c2785bff82 100644 (file)
--- 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);