linux-kernel - Re: [PATCH] KVM: x86/mmu: Avoid modulo operator on 64-bit value to fix i386 build

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Message-ID: <94427d37-03af-6d78-2039-cd326710904b@redhat.com>
Date:   Sat, 24 Oct 2020 08:29:06 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Daniel Díaz <daniel.diaz@...aro.org>
Subject: Re: [PATCH] KVM: x86/mmu: Avoid modulo operator on 64-bit value to
 fix i386 build

On 24/10/20 05:11, Sean Christopherson wrote:
> Replace a modulo operator with the more common pattern for computing the
> gfn "offset" of a huge page to fix an i386 build error.
> 
>   arch/x86/kvm/mmu/tdp_mmu.c:212: undefined reference to `__umoddi3'
> 
> Fixes: 2f2fad0897cb ("kvm: x86/mmu: Add functions to handle changed TDP SPTEs")
> Reported-by: Daniel Díaz <daniel.diaz@...aro.org>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
> ---
> 
> Linus, do you want to take this directly so that it's in rc1?  I don't
> know whether Paolo will be checking mail before then

Yes, I am.  I also have another bugfix, I was going to wait a couple
days for any -rc1 issues to pop up but they came up faster than that.

Paolo