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Subject: Re: [RFC 2/2] Use unified UUID/GUID definition in gfs2
From: Huang Ying <ying.huang@intel.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Joe Perches <joe@perches.com>, Steven Whitehouse <swhiteho@redhat.com>,
       Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
       "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
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Date: Tue, 03 Nov 2009 15:21:59 +0800
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On Tue, 2009-11-03 at 09:02 +0800, Andrew Morton wrote: 
> On Tue, 03 Nov 2009 08:44:48 +0800
> Huang Ying <ying.huang@intel.com> wrote:
> 
> > For stuff of no use to user space, I think it can be enclosed into
> > 
> > #ifdef __KERNEL__
> > #endif
> 
> It can, but that's ugly.  Clearly separating the inclusions into uuid-kernel.h
> and uuid-user-h is nicer, no?

But it seems that __KERNEL__ is common used method now. There are about
370 out of 3085 files under linux/include use __KERNEL__. The data are
gotten via:

# cd linux/include
# find . -type f | wc -l
# grep __KERNEL__ -lr * | wc -l

Best Regards,
Huang Ying