linux-kernel - Re: [PATCH 2/8] KVM: x86: cleanup kvm_apic_match

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Date:	Fri, 30 Jan 2015 09:52:56 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Radim Krčmář <rkrcmar@...hat.com>,
	linux-kernel@...r.kernel.org
CC:	kvm@...r.kernel.org, Nadav Amit <namit@...technion.ac.il>,
	Gleb Natapov <gleb@...nel.org>
Subject: Re: [PATCH 2/8] KVM: x86: cleanup kvm_apic_match_*()



On 29/01/2015 22:48, Radim Krčmář wrote:
> The majority of this patch turns
>   result = 0; if (CODE) result = 1; return result;
> into
>   return CODE;
> because we return bool now.

Added a bunch of "!= 0" to avoid automagic conversion to bool.

Paolo

> Signed-off-by: Radim Krčmář <rkrcmar@...hat.com>
> ---
>  arch/x86/kvm/lapic.c | 44 +++++++++++++++-----------------------------
>  1 file changed, 15 insertions(+), 29 deletions(-)
> 
> diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
> index 478dd8bd653b..271e7d076879 100644
> --- a/arch/x86/kvm/lapic.c
> +++ b/arch/x86/kvm/lapic.c
> @@ -594,42 +594,34 @@ static bool kvm_apic_match_physical_addr(struct kvm_lapic *apic, u32 dest)
>  
>  static bool kvm_apic_match_logical_addr(struct kvm_lapic *apic, u32 mda)
>  {
> -	int result = 0;
>  	u32 logical_id;
>  
>  	if (kvm_apic_broadcast(apic, mda))
> -		return 1;
> +		return true;
>  
> -	if (apic_x2apic_mode(apic)) {
> -		logical_id = kvm_apic_get_reg(apic, APIC_LDR);
> +	logical_id = kvm_apic_get_reg(apic, APIC_LDR);
> +
> +	if (apic_x2apic_mode(apic))
>  		return logical_id & mda;
> -	}
>  
> -	logical_id = GET_APIC_LOGICAL_ID(kvm_apic_get_reg(apic, APIC_LDR));
> +	logical_id = GET_APIC_LOGICAL_ID(logical_id);
>  
>  	switch (kvm_apic_get_reg(apic, APIC_DFR)) {
>  	case APIC_DFR_FLAT:
> -		if (logical_id & mda)
> -			result = 1;
> -		break;
> +		return logical_id & mda;
>  	case APIC_DFR_CLUSTER:
> -		if (((logical_id >> 4) == (mda >> 0x4))
> -		    && (logical_id & mda & 0xf))
> -			result = 1;
> -		break;
> +		return ((logical_id >> 4) == (mda >> 4))
> +		       && (logical_id & mda & 0xf);
>  	default:
>  		apic_debug("Bad DFR vcpu %d: %08x\n",
>  			   apic->vcpu->vcpu_id, kvm_apic_get_reg(apic, APIC_DFR));
> -		break;
> +		return false;
>  	}
> -
> -	return result;
>  }
>  
>  bool kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
>  			   int short_hand, unsigned int dest, int dest_mode)
>  {
> -	int result = 0;
>  	struct kvm_lapic *target = vcpu->arch.apic;
>  
>  	apic_debug("target %p, source %p, dest 0x%x, "
> @@ -641,27 +633,21 @@ bool kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
>  	case APIC_DEST_NOSHORT:
>  		if (dest_mode == 0)
>  			/* Physical mode. */
> -			result = kvm_apic_match_physical_addr(target, dest);
> +			return kvm_apic_match_physical_addr(target, dest);
>  		else
>  			/* Logical mode. */
> -			result = kvm_apic_match_logical_addr(target, dest);
> -		break;
> +			return kvm_apic_match_logical_addr(target, dest);
>  	case APIC_DEST_SELF:
> -		result = (target == source);
> -		break;
> +		return target == source;
>  	case APIC_DEST_ALLINC:
> -		result = 1;
> -		break;
> +		return true;
>  	case APIC_DEST_ALLBUT:
> -		result = (target != source);
> -		break;
> +		return target != source;
>  	default:
>  		apic_debug("kvm: apic: Bad dest shorthand value %x\n",
>  			   short_hand);
> -		break;
> +		return false;
>  	}
> -
> -	return result;
>  }
>  
>  bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src,
> 
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