[PATCH net] hyperv: Fix a compiler warning in netvsc_send()

[Haiyang Zhang]

> -----Original Message-----
> From: David Miller [mailto:davem at davemloft.net] 
> Sent: Tuesday, April 16, 2013 3:49 PM
> To: Haiyang Zhang
> Cc: netdev at vger.kernel.org; KY Srinivasan; olaf at aepfle.de; jasowang at redhat.com; linux-kernel at vger.kernel.org; devel at linuxdriverproject.org
> Subject: Re: [PATCH net] hyperv: Fix a compiler warning in netvsc_send()
>
> From: Haiyang Zhang <haiyangz at microsoft.com>
> Date: Tue, 16 Apr 2013 19:34:52 +0000
>
> > The Hyper-V hosts always use 64 bit request id. The guests can have
> > 32 or 64 bit pointers which equal to the ulong type size. So we cast 
> > it to ulong type. And, assigning 32bit integer to 64 bit variable 
> > works fine.
>
> It works fine, but it's unclean.
>
> Keep the req_id type as "u64", because that's what it is, a 64-bit request ID.

I will make this update and submit a new patch, with the added comments.

Thanks,
- Haiyang