linux-kernel - Re: [PATCH 12/21] Staging: hv: Cleanup irq management

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Date:	Thu, 10 Mar 2011 23:46:08 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"K. Y. Srinivasan" <kys@...rosoft.com>
cc:	gregkh@...e.de, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, virtualization@...ts.osdl.org,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	Mike Sterling <mike.sterling@...rosoft.com>,
	Abhishek Kane <v-abkane@...rosoft.com>,
	Hank Janssen <hjanssen@...rosoft.com>
Subject: Re: [PATCH 12/21] Staging: hv: Cleanup irq management

On Thu, 10 Mar 2011, K. Y. Srinivasan wrote:
> Now that vmbus_driver is a platform pci driver,
> cleanup the irq allocation mess by using the standard
> irq allocation mechanisms.
> 
> Note that this patch generates an error when the checkpatch
> script is run because of the IRQF_SAMPLE_RANDOM flag used in
> request_irq() function. This interrupt is the only
> external event this VM will get and consequently if this
> flag (IRQF_SAMPLE_RANDOM) is not  specified, experimentally
> we have shown that the entropy in the VM will very very low.

Fair enough. We need to come up with some way to work around
this though.
 
>  	}
> -	vector = VMBUS_IRQ_VECTOR;
>  
> -	DPRINT_INFO(VMBUS_DRV, "irq 0x%x vector 0x%x", vmbus_irq, vector);
> +	vector = IRQ0_VECTOR + pdev->irq;
> +	DPRINT_INFO(VMBUS_DRV, "irq 0x%x vector 0x%x", pdev->irq,
> +			IRQ0_VECTOR + pdev->irq);

Why evaluating vector first and then not using it for that debug print
thingy?

Btw, are you going to replace that DPRINT_* stuff as well ?

Thanks,

	tglx
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