linux-kernel - Re: [PATCH 1/8] KVM: x86/mmu: Drop unused CMPXCHG macro from paging

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Date:   Tue, 14 Jun 2022 10:13:14 +0800
From:   Lai Jiangshan <jiangshanlai@...il.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        "open list:KERNEL VIRTUAL MACHINE FOR MIPS (KVM/mips)" 
        <kvm@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/8] KVM: x86/mmu: Drop unused CMPXCHG macro from paging_tmpl.h

On Tue, Jun 14, 2022 at 6:59 AM Sean Christopherson <seanjc@...gle.com> wrote:
>
> Drop the CMPXCHG macro from paging_tmpl.h, it's no longer used now that
> KVM uses a common uaccess helper to do 8-byte CMPXCHG.
>
> Fixes: f122dfe44768 ("KVM: x86: Use __try_cmpxchg_user() to update guest PTE A/D bits")
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>


In https://lore.kernel.org/lkml/20220605063417.308311-2-jiangshanlai@gmail.com/
two other unused macros are also removed.