linux-kernel - Re: [PATCH] KVM: x86: Remove unnecessary export of kvm_cpu_has_pending

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Date:   Mon, 14 Nov 2022 14:50:25 +0800
From:   Like Xu <like.xu.linux@...il.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [PATCH] KVM: x86: Remove unnecessary export of
 kvm_cpu_has_pending_timer()

On 10/11/2022 9:03 am, Sean Christopherson wrote:
> Don't export x86's kvm_cpu_has_pending_timer(), the helper isn't used by
> KVM x86's vendor modules.
> 
> No functional change intended.

The callers of EXPORT_SYMBOL (considering that this line of code has been around
for a long time) will not be public like the callers of EXPORT_SYMBOL_GPL.

Whether we close this door in the future or not, this description is inappropriate.

> 
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>
> ---
>   arch/x86/kvm/irq.c | 1 -
>   1 file changed, 1 deletion(-)
> 
> diff --git a/arch/x86/kvm/irq.c b/arch/x86/kvm/irq.c
> index d8d50558f165..04a009fbdf8a 100644
> --- a/arch/x86/kvm/irq.c
> +++ b/arch/x86/kvm/irq.c
> @@ -31,7 +31,6 @@ int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
>   
>   	return r;
>   }
> -EXPORT_SYMBOL(kvm_cpu_has_pending_timer);

Not sure if the kernel's symbol or kbuild sub-system has tools to
automatically warn or turn off similar interface exposures.

>   
>   /*
>    * check if there is a pending userspace external interrupt
> 
> base-commit: d663b8a285986072428a6a145e5994bc275df994