linux-kernel - Re: [PATCH] xen: minor fix in apic ipi interface func

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Message-ID: <20130409192054.GA1768@phenom.dumpdata.com>
Date:	Tue, 9 Apr 2013 15:20:54 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Zhenzhong Duan <zhenzhong.duan@...cle.com>
Cc:	xen-devel@...ts.xensource.com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Feng Jin <joe.jin@...cle.com>, ben@...hro.net
Subject: Re: [PATCH] xen: minor fix in apic ipi interface func

On Tue, Apr 09, 2013 at 06:51:09PM +0800, Zhenzhong Duan wrote:
> xen_send_IPI_mask_allbutself uses native vector as input other than xen_vector.

Ouch. But it looks as the only user of the .send_IPI_mask_allbutself
is just xen_send_IPI_allbutself? Or is there another user of this?


Is there a particular bug that was found with this?
> 
> xen_send_IPI_one need to be called to pass xen_vector in xen_send_IPI_mask_allbutself.

Right, as we are using now 'xen_vector'.

> 
> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@...cle.com>
> ---
>  arch/x86/xen/smp.c |   11 ++++++-----
>  1 files changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
> index 09ea61d..bf27868 100644
> --- a/arch/x86/xen/smp.c
> +++ b/arch/x86/xen/smp.c
> @@ -565,6 +565,10 @@ void xen_send_IPI_mask_allbutself(const struct cpumask *mask,
>  {
>  	unsigned cpu;
>  	unsigned int this_cpu = smp_processor_id();
> +	int xen_vector = xen_map_vector(vector);
> +
> +	if (xen_vector < 0)
> +		return;
>  
>  	if (!(num_online_cpus() > 1))
>  		return;
> @@ -573,16 +577,13 @@ void xen_send_IPI_mask_allbutself(const struct cpumask *mask,
>  		if (this_cpu == cpu)
>  			continue;
>  
> -		xen_smp_send_call_function_single_ipi(cpu);
> +		xen_send_IPI_one(cpu, xen_vector);
>  	}
>  }
>  
>  void xen_send_IPI_allbutself(int vector)
>  {
> -	int xen_vector = xen_map_vector(vector);
> -
> -	if (xen_vector >= 0)
> -		xen_send_IPI_mask_allbutself(cpu_online_mask, xen_vector);
> +	xen_send_IPI_mask_allbutself(cpu_online_mask, vector);
>  }
>  
>  static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id)
> -- 
> 1.7.3
> 
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