linux-kernel - Re: [PATCH v2] KVM: guest-memfd: fix unused-function warning

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Message-ID: <ZXNo1Rdla2zghM9s@google.com>
Date:   Fri, 8 Dec 2023 11:04:53 -0800
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v2] KVM: guest-memfd: fix unused-function warning

On Fri, Dec 08, 2023, Paolo Bonzini wrote:
> With migration disabled, one function becomes unused:
> 
> virt/kvm/guest_memfd.c:262:12: error: 'kvm_gmem_migrate_folio' defined but not used [-Werror=unused-function]
>   262 | static int kvm_gmem_migrate_folio(struct address_space *mapping,
>       |            ^~~~~~~~~~~~~~~~~~~~~~
> 
> Remove the #ifdef around the reference so that fallback_migrate_folio()
> is never used.  The gmem implementation of the hook is trivial; since
> the gmem mapping is unmovable, the pages should not be migrated anyway.
> 
> Fixes: a7800aa80ea4 ("KVM: Add KVM_CREATE_GUEST_MEMFD ioctl() for guest-specific backing memory")
> Reported-by: Arnd Bergmann <arnd@...db.de>
> Suggested-by: Sean Christopherson <seanjc@...gle.com>
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> ---

Reviewed-by: Sean Christopherson <seanjc@...gle.com>