linux-kernel - [PATCH] KVM: explicitly set rmap_head->val to 0 in pte_list_desc_remove

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Message-ID: <1575517216-5571-1-git-send-email-linmiaohe@huawei.com>
Date:   Thu, 5 Dec 2019 11:40:16 +0800
From:   linmiaohe <linmiaohe@...wei.com>
To:     <pbonzini@...hat.com>, <rkrcmar@...hat.com>,
        <sean.j.christopherson@...el.com>, <vkuznets@...hat.com>,
        <wanpengli@...cent.com>, <jmattson@...gle.com>, <joro@...tes.org>,
        <tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
        <hpa@...or.com>
CC:     <linmiaohe@...wei.com>, <kvm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <x86@...nel.org>
Subject: [PATCH] KVM: explicitly set rmap_head->val to 0 in pte_list_desc_remove_entry()

From: Miaohe Lin <linmiaohe@...wei.com>

When we reach here, we have desc->sptes[j] = NULL with j = 0.
So we can replace desc->sptes[0] with 0 to make it more clear.
Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
 arch/x86/kvm/mmu/mmu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 6f92b40d798c..a81c605abbba 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -1410,7 +1410,7 @@ pte_list_desc_remove_entry(struct kvm_rmap_head *rmap_head,
 	if (j != 0)
 		return;
 	if (!prev_desc && !desc->more)
-		rmap_head->val = (unsigned long)desc->sptes[0];
+		rmap_head->val = 0;
 	else
 		if (prev_desc)
 			prev_desc->more = desc->more;
-- 
2.19.1