linux-kernel - RE: [PATCH net] hyperv: Fix a compiler warning in netvsc

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Date:	Tue, 16 Apr 2013 20:18:05 +0000
From:	Haiyang Zhang <haiyangz@...rosoft.com>
To:	David Miller <davem@...emloft.net>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	KY Srinivasan <kys@...rosoft.com>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>
Subject: RE: [PATCH net] hyperv: Fix a compiler warning in netvsc_send()

> -----Original Message-----
> From: David Miller [mailto:davem@...emloft.net] 
> Sent: Tuesday, April 16, 2013 3:49 PM
> To: Haiyang Zhang
> Cc: netdev@...r.kernel.org; KY Srinivasan; olaf@...fle.de; jasowang@...hat.com; linux-kernel@...r.kernel.org; devel@...uxdriverproject.org
> Subject: Re: [PATCH net] hyperv: Fix a compiler warning in netvsc_send()
>
> From: Haiyang Zhang <haiyangz@...rosoft.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
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