linux-kernel - Re: [PATCH] KVM: remove redundant code in kvm_arch_vm

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Message-ID: <alpine.DEB.2.21.1910211015260.1904@nanos.tec.linutronix.de>
Date:   Mon, 21 Oct 2019 10:16:40 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Miaohe Lin <linmiaohe@...wei.com>
cc:     pbonzini@...hat.com, rkrcmar@...hat.com,
        sean.j.christopherson@...el.com, vkuznets@...hat.com,
        wanpengli@...cent.com, jmattson@...gle.com, joro@...tes.org,
        mingo@...hat.com, bp@...en8.de, hpa@...or.com, x86@...nel.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: remove redundant code in kvm_arch_vm_ioctl

On Mon, 21 Oct 2019, Miaohe Lin wrote:
> If we reach here with r = 0, we will reassign r = 0
> unnecesarry, then do the label set_irqchip_out work.
> If we reach here with r != 0, then we will do the label
> work directly. So this if statement and r = 0 assignment
> is redundant.
> 
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
> ---
>  arch/x86/kvm/x86.c | 3 ---
>  1 file changed, 3 deletions(-)
> 
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 661e2bf38526..0b3ebc2afb3d 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -4916,9 +4916,6 @@ long kvm_arch_vm_ioctl(struct file *filp,
>  		if (!irqchip_kernel(kvm))
>  			goto set_irqchip_out;
>  		r = kvm_vm_ioctl_set_irqchip(kvm, chip);
> -		if (r)
> -			goto set_irqchip_out;
> -		r = 0;
>  	set_irqchip_out:
>  		kfree(chip);
>  		break;

Can you please get rid of that odd jump label completely?

  		if (irqchip_kernel(kvm))
			r = kvm_vm_ioctl_set_irqchip(kvm, chip);

Hmm?


Thanks,

	tglx