linux-kernel - Re: [PATCH] KVM: x86: VMX: fix building without CONFIG

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Message-ID: <20180526141810.GA23390@flask>
Date:   Sat, 26 May 2018 16:18:11 +0200
From:   Radim Krčmář <rkrcmar@...hat.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Lan Tianyu <Tianyu.Lan@...rosoft.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Jim Mattson <jmattson@...gle.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        David Hildenbrand <david@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: x86: VMX: fix building without CONFIG_HYPERV

2018-05-25 17:36+0200, Arnd Bergmann:
> The global ms_hyperv variable is part of the hyperv support, so
> we get a link error from accessing it in kernels that have this
> turned off:
> 
> arch/x86/kvm/vmx.o: In function `alloc_loaded_vmcs':
> vmx.c:(.text+0x1654a): undefined reference to `ms_hyperv'
> vmx.c:(.text+0x1657a): undefined reference to `ms_hyperv'
> 
> This changes the condition to first check the compile-time
> configuration symbol to avoid the link error.
> 
> Fixes: ceef7d10dfb6 ("KVM: x86: VMX: hyper-v: Enlightened MSR-Bitmap support")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Queued, thanks.