linux-kernel - [PATCH v3 2/3] RISC-V: Issue a tlb page flush if possible

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Date:   Wed, 21 Aug 2019 17:46:43 -0700
From:   Atish Patra <atish.patra@....com>
To:     linux-kernel@...r.kernel.org
Cc:     Atish Patra <atish.patra@....com>,
        Albert Ou <aou@...s.berkeley.edu>,
        linux-riscv@...ts.infradead.org,
        Palmer Dabbelt <palmer@...ive.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Christoph Hellwig <hch@....de>,
        Anup Patel <Anup.Patel@....com>,
        Andreas Schwab <schwab@...ux-m68k.org>
Subject: [PATCH v3 2/3] 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@....com>
---
 arch/riscv/mm/tlbflush.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/mm/tlbflush.c b/arch/riscv/mm/tlbflush.c
index 36430ee3bed9..9f58b3790baa 100644
--- a/arch/riscv/mm/tlbflush.c
+++ b/arch/riscv/mm/tlbflush.c
@@ -22,7 +22,10 @@ static void __sbi_tlb_flush_range(struct cpumask *cmask, unsigned long start,
 	}
 
 	if (cpumask_test_cpu(cpuid, cmask) && cpumask_weight(cmask) == 1) {
-		local_flush_tlb_all();
+		if (size <= PAGE_SIZE && size != -1)
+			local_flush_tlb_page(start);
+		else
+			local_flush_tlb_all();
 		goto done;
 	}
 	riscv_cpuid_to_hartid_mask(cmask, &hmask);
-- 
2.21.0