linux-kernel - Re: [PATCH 3/3] Makes lguest's irq handler typesafe

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Date:	Fri, 18 Jan 2008 15:45:41 -0500
From:	Jeff Garzik <jgarzik@...ox.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
CC:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ash Willis <ashwillis@...grammer.net>,
	linux-pcmcia@...ts.infradead.org,
	virtualization@...ts.linux-foundation.org,
	Tejun Heo <htejun@...il.com>
Subject: Re: [PATCH 3/3] Makes lguest's irq handler typesafe

Rusty Russell wrote:
> Just a trivial example.
> ---
>  drivers/lguest/lguest_device.c |    3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff -r 00ab7672f658 drivers/lguest/lguest_device.c
> --- a/drivers/lguest/lguest_device.c	Thu Jan 17 16:54:00 2008 +1100
> +++ b/drivers/lguest/lguest_device.c	Thu Jan 17 16:59:46 2008 +1100
> @@ -179,9 +179,8 @@ static void lg_notify(struct virtqueue *
>  	hcall(LHCALL_NOTIFY, lvq->config.pfn << PAGE_SHIFT, 0, 0);
>  }
>  
> -static irqreturn_t lguest_interrupt(int irq, void *_vq)
> +static irqreturn_t lguest_interrupt(int irq, struct virtqueue *vq)
>  {
> -	struct virtqueue *vq = _vq;
>  	struct lguest_device_desc *desc = to_lgdev(vq->vdev)->desc;

Ugh.

This will be a compatibility nightmare.  I don't see how void* is so 
evil for this, or timers.

It's not like there's a huge cost associated with a pointer alias.

	Jeff



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