linux-kernel - RE: [PATCH 020/117] Staging: hv: vmbus: Support the notion of id tables in vmbus

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Date:	Sat, 16 Jul 2011 12:54:46 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Christoph Hellwig <hch@...radead.org>
CC:	"gregkh@...e.de" <gregkh@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"virtualization@...ts.osdl.org" <virtualization@...ts.osdl.org>,
	Haiyang Zhang <haiyangz@...rosoft.com>
Subject: RE: [PATCH 020/117] Staging: hv: vmbus: Support the notion of id
 tables in vmbus_match()



> -----Original Message-----
> From: Christoph Hellwig [mailto:hch@...radead.org]
> Sent: Friday, July 15, 2011 10:03 PM
> To: KY Srinivasan
> Cc: gregkh@...e.de; linux-kernel@...r.kernel.org;
> devel@...uxdriverproject.org; virtualization@...ts.osdl.org; Haiyang Zhang
> Subject: Re: [PATCH 020/117] Staging: hv: vmbus: Support the notion of id tables
> in vmbus_match()
> 
> On Fri, Jul 15, 2011 at 10:46:08AM -0700, K. Y. Srinivasan wrote:
> > +static bool is_not_null_guid(const __u8 *guid)
> > +{
> > +	int i;
> > +
> > +	for (i = 0; i < (sizeof(struct hv_vmbus_device_id)); i++)
> > +		if (guid[i] != 0)
> > +			return true;
> > +	return false;
> > +}
> 
> would be nice to add uuid_{le,be}_is_nil helpers to uuid.h.  I also
> think simply using a memcpy might be more efficient than the hand-rolled
> loop.
Having a helper function would be great. With regards to the efficiency of this loop,
this is not a performance critical path. If people feel strongly about this, I could 
change this; perhaps as a separate patch on top of this series; I don't want to send a large
patch-set like this again.

Regards,

K. Y
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