linux-kernel - Re: [PATCH] KVM: arm64: remove incorrect _

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Date:   Sun, 3 Jan 2021 19:38:44 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Marc Zyngier <maz@...nel.org>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        David Brazdil <dbrazdil@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Andrew Scull <ascull@...gle.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        kvmarm@...ts.cs.columbia.edu,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] KVM: arm64: remove incorrect __init annotation

On Sun, Jan 3, 2021 at 5:43 PM Marc Zyngier <maz@...nel.org> wrote:
>
> On Sun, 03 Jan 2021 14:00:50 +0000,
> Arnd Bergmann <arnd@...nel.org> wrote:
> >
> > From: Arnd Bergmann <arnd@...db.de>
> >
> > When hyp_cpu_pm_exit() is not inlined, it causes a link time warning:
> >
> > WARNING: modpost: vmlinux.o(.text+0x39974): Section mismatch in reference from the function kvm_arch_init() to the function .init.text:hyp_cpu_pm_exit()
> > The function kvm_arch_init() references
> > the function __init hyp_cpu_pm_exit().
> > This is often because kvm_arch_init lacks a __init
> > annotation or the annotation of hyp_cpu_pm_exit is wrong.
> >
> > This is not only called at boot time, so remove the annotation
> > to prevent undefined behavior in case it gets called after being
> > freed.
>
> It *is* only called at boot time (despite these functions being called
> from module_init(), KVM cannot be built as a module on arm64).

Ah, I see where I went wrong: I looked at the callers of kvm_arch_init_vm()
instead of kvm_arch_init().

      Arnd