linux-kernel - [PATCH] RISC-V: KVM: use bitmap

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Message-ID: <202305061710302032748@zte.com.cn>
Date:   Sat, 6 May 2023 17:10:30 +0800 (CST)
From:   <ye.xingchen@....com.cn>
To:     <anup@...infault.org>
Cc:     <atishp@...shpatra.org>, <paul.walmsley@...ive.com>,
        <palmer@...belt.com>, <aou@...s.berkeley.edu>,
        <kvm@...r.kernel.org>, <kvm-riscv@...ts.infradead.org>,
        <linux-riscv@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] RISC-V: KVM: use bitmap_zero() API

From: Ye Xingchen <ye.xingchen@....com.cn>

bitmap_zero() is faster than bitmap_clear(), so use bitmap_zero()
instead of bitmap_clear().

Signed-off-by: Ye Xingchen <ye.xingchen@....com.cn>
---
 arch/riscv/kvm/tlb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/kvm/tlb.c b/arch/riscv/kvm/tlb.c
index 0e5479600695..44bc324aeeb0 100644
--- a/arch/riscv/kvm/tlb.c
+++ b/arch/riscv/kvm/tlb.c
@@ -296,7 +296,7 @@ static void make_xfence_request(struct kvm *kvm,
 	unsigned int actual_req = req;
 	DECLARE_BITMAP(vcpu_mask, KVM_MAX_VCPUS);

-	bitmap_clear(vcpu_mask, 0, KVM_MAX_VCPUS);
+	bitmap_zero(vcpu_mask, KVM_MAX_VCPUS);
 	kvm_for_each_vcpu(i, vcpu, kvm) {
 		if (hbase != -1UL) {
 			if (vcpu->vcpu_id < hbase)
-- 
2.25.1