linux-kernel - Re: [PATCH 10/14] KVM: x86: Remove unnecessary export of kvm_vcpu_is_reset

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Message-ID: <Y4gMU3bKSE4Pu6Gk@google.com>
Date:   Thu, 1 Dec 2022 02:07:15 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Like Xu <like.xu.linux@...il.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/14] KVM: x86: Remove unnecessary export of
 kvm_vcpu_is_reset_bsp()

On Mon, Nov 14, 2022, Like Xu wrote:
> From: Like Xu <likexu@...cent.com>
> 
> Don't export x86's kvm_vcpu_is_reset_bsp(), the helper isn't used by
> KVM x86's vendor modules. Move up the code block out of existing
> callers' need.

Again, no.  kvm_vcpu_is_reset_bsp() is declared by kvm_vcpu_is_reset_bsp().  The
lack of "static" is the first clue, and the fact that KVM compiles without issue
today is the second clue.  EXPORT_SYMBOL_GPL() only affects resolving module
dependencies, it doesn't provide any information to the compiler about function
prototypes.

> Signed-off-by: Like Xu <likexu@...cent.com>
> ---
>  arch/x86/kvm/x86.c | 11 +++++------
>  1 file changed, 5 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index f325710a4f25..f3cb3e02bfa6 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -11496,6 +11496,11 @@ int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
>  	return static_call(kvm_x86_vcpu_precreate)(kvm);
>  }
>  
> +bool kvm_vcpu_is_reset_bsp(struct kvm_vcpu *vcpu)
> +{
> +	return vcpu->kvm->arch.bsp_vcpu_id == vcpu->vcpu_id;
> +}
> +
>  int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
>  {
>  	struct page *page;
> @@ -11993,12 +11998,6 @@ int kvm_arch_check_processor_compat(void *opaque)
>  	return ops->check_processor_compatibility();
>  }
>  
> -bool kvm_vcpu_is_reset_bsp(struct kvm_vcpu *vcpu)
> -{
> -	return vcpu->kvm->arch.bsp_vcpu_id == vcpu->vcpu_id;
> -}
> -EXPORT_SYMBOL_GPL(kvm_vcpu_is_reset_bsp);
> -
>  bool kvm_vcpu_is_bsp(struct kvm_vcpu *vcpu)
>  {
>  	return (vcpu->arch.apic_base & MSR_IA32_APICBASE_BSP) != 0;
> -- 
> 2.38.1
>