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From: David Miller <davem@davemloft.net>
Subject: Re: dst->obsolete has become pointless
Date: Wed, 09 Nov 2011 19:24:27 -0500 (EST)
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From: Joe Perches <joe@perches.com>
Date: Wed, 09 Nov 2011 15:56:09 -0800

> As far as I know, other than being large enough to
> store a 1 and 0, it's implementation defined.
> 
> Just like an unsigned short.
> 
> I _believe_ gcc uses unsigned char width for
> _Bool in all normal cases though.

We can only use it in this scenerio if it universally
uses the same type.  This is due to the by-hand layout
of the rest of the structure such that __refcnt ends
up on a different cache line.