linux-kernel - Re: [PATCH 2/3] xen/arm: do not handle VCPUOP_register_vcpu

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Message-ID: <1368015421.26321.263.camel@zakaz.uk.xensource.com>
Date:	Wed, 8 May 2013 13:17:01 +0100
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
CC:	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
	Julien Grall <julien.grall@...rix.com>
Subject: Re: [PATCH 2/3] xen/arm: do not handle VCPUOP_register_vcpu_info
 failures

On Wed, 2013-05-08 at 13:11 +0100, Stefano Stabellini wrote:
> We expect VCPUOP_register_vcpu_info to succeed, do not try to handle
> failures.
> 
> Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
> ---
>  arch/arm/xen/enlighten.c |   11 ++++-------
>  1 files changed, 4 insertions(+), 7 deletions(-)
> 
> diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
> index 83d13b0..519acf9 100644
> --- a/arch/arm/xen/enlighten.c
> +++ b/arch/arm/xen/enlighten.c
> @@ -165,13 +165,10 @@ static int __init xen_secondary_init(unsigned int cpu)
>  	info.offset = offset_in_page(vcpup);
>  
>  	err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info);
> -	if (err) {
> -		pr_debug("register_vcpu_info failed: err=%d\n", err);
> -	} else {
> -		/* This cpu is using the registered vcpu info, even if
> -		   later ones fail to. */
> -		per_cpu(xen_vcpu, cpu) = vcpup;
> -	}
> +	if (err)
> +		BUG();

AKA BUG_ON(err);

Acked-by: Ian Campbell <ian.campbell@...rix.com>

> +	per_cpu(xen_vcpu, cpu) = vcpup;
> +
>  	return 0;
>  }
>  


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