From: Atish Patra <atish.patra@wdc.com>
Date: Thu, 22 Aug 2019 07:51:51 +0000 (-0700)
Subject: RISC-V: Issue a tlb page flush if possible
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=6efb16b1d5514865d0f7a01910648568ad3225d8;p=linux.git

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 3531d46473232..720b443c4528f 100644
--- 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);