linux-kernel - Re: [PATCH 6/9] xen/spinlock: Check against default value of -1 for IRQ line.

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Message-ID: <alpine.DEB.2.02.1304261717300.4180@kaball.uk.xensource.com>
Date:	Fri, 26 Apr 2013 17:18:01 +0100
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>
Subject: Re: [PATCH 6/9] xen/spinlock:  Check against default value of -1
 for IRQ line.

On Tue, 16 Apr 2013, Konrad Rzeszutek Wilk wrote:
> The default (uninitialized) value of the IRQ line is -1.
> Check if we already have allocated an spinlock interrupt line
> and if somebody is trying to do it again. Also set it to -1
> when we offline the CPU.
> 
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> ---
>  arch/x86/xen/spinlock.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/arch/x86/xen/spinlock.c b/arch/x86/xen/spinlock.c
> index f7a080e..47ae032 100644
> --- a/arch/x86/xen/spinlock.c
> +++ b/arch/x86/xen/spinlock.c
> @@ -364,6 +364,9 @@ void __cpuinit xen_init_lock_cpu(int cpu)
>  	int irq;
>  	const char *name;
>  
> +	WARN(per_cpu(lock_kicker_irq, cpu) > 0, "spinlock on CPU%d exists on IRQ%d!\n",
                  shouldn't this be >= ^


> +	     cpu, per_cpu(lock_kicker_irq, cpu));
>
>  	name = kasprintf(GFP_KERNEL, "spinlock%d", cpu);
>  	irq = bind_ipi_to_irqhandler(XEN_SPIN_UNLOCK_VECTOR,
>  				     cpu,
> @@ -383,6 +386,7 @@ void __cpuinit xen_init_lock_cpu(int cpu)
>  void xen_uninit_lock_cpu(int cpu)
>  {
>  	unbind_from_irqhandler(per_cpu(lock_kicker_irq, cpu), NULL);
> +	per_cpu(lock_kicker_irq, cpu) = -1;
>  }
>  
>  void __init xen_init_spinlocks(void)
> -- 
> 1.8.1.4
> 
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