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

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Date:   Tue, 14 Jun 2022 14:31:28 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Lai Jiangshan <jiangshanlai@...il.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, Lai Jiangshan wrote:
> 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.

I'd prefer to keep them around as it allows using them to generate the other masks
that are used.

My apologies for colliding with your series, I saw it flash by but didn't look at
what it contained.  If it's ok with you, I'll grab patches 1-3 from your series,
tweak patch 1 to drop only CMPXCH, and send them as the basis of v2 for the rest
of the patches in this series.