linux-kernel - Re: [PATCH v2] KVM: SVM: hyper-v: placate modpost section mismatch error

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Date:   Thu, 23 Feb 2023 23:11:27 +0200
From:   Zhi Wang <zhi.wang.linux@...il.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        linux-kernel@...r.kernel.org,
        Vineeth Pillai <viremana@...ux.microsoft.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>, kvm@...r.kernel.org
Subject: Re: [PATCH v2] KVM: SVM: hyper-v: placate modpost section mismatch
 error

On Wed, 22 Feb 2023 19:32:53 +0100
Paolo Bonzini <pbonzini@...hat.com> wrote:

Maybe we can use __always_inline? I just noticed this thread today by chance.

https://lore.kernel.org/all/20210624095147.880513802@infradead.org/

> On 2/22/23 17:46, Sean Christopherson wrote:
> >    Tag svm_hv_hardware_setup() with __init to fix a modpost warning as the
> >    non-stub implementation accesses __initdata (svm_x86_ops), i.e. would
> >    generate a use-after-free if svm_hv_hardware_setup() were actually invoked
> >    post-init.  The helper is only called from svm_hardware_setup(), which is
> >    also __init, i.e. other than the modpost warning, lack of __init is benign.
> 
> Done.  It's caused by the compiler deciding not to inline the function, 
> probably.
> 
> Also Cc'ed stable.
> 
> Paolo
>