linux-kernel - Re: [PATCH v11 17/17]add two new ioctls for mp device.

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Date:	Mon, 27 Sep 2010 22:36:15 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	xiaohui.xin@...el.com
Cc:	netdev@...r.kernel.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, mingo@...e.hu, davem@...emloft.net,
	herbert@...dor.hengli.com.au, jdike@...ux.intel.com
Subject: Re: [PATCH v11 17/17]add two new ioctls for mp device.

On Sat, 2010-09-25 at 12:27 +0800, xiaohui.xin@...el.com wrote:
> From: Xin Xiaohui <xiaohui.xin@...el.com>
> 
> The patch add two ioctls for mp device.
> One is for userspace to query how much memory locked to make mp device
> run smoothly. Another one is for userspace to set how much meory locked
> it really wants.
[...]
> diff --git a/include/linux/mpassthru.h b/include/linux/mpassthru.h
> index ba8f320..083e9f7 100644
> --- a/include/linux/mpassthru.h
> +++ b/include/linux/mpassthru.h
> @@ -7,6 +7,8 @@
>  /* ioctl defines */
>  #define MPASSTHRU_BINDDEV      _IOW('M', 213, int)
>  #define MPASSTHRU_UNBINDDEV    _IO('M', 214)
> +#define MPASSTHRU_SET_MEM_LOCKED	_IOW('M', 215, unsigned long)
> +#define MPASSTHRU_GET_MEM_LOCKED_NEED	_IOR('M', 216, unsigned long)
[...]

These will need compat handling.  You can avoid that by defining them to
use a parameter type of u32 or u64.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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