Re: [PATCH] Keys: Add possessor permissions to keys

[Linus Torvalds]

On Wed, 21 Sep 2005, Andrew Morton wrote:
> 
> hrmph.  Of course it's a reasonable trick from a performance and
> convenience and resource consumption POV.  But it's a new idiom and the
> threshold for new idioms is non-zero.  We use it in struct page, but struct
> page is special.

Hmm.. I don't feel it is that new, but maybe that's because I've used that 
trick in other places. I think it's pretty common in a "type-safe C" way, 
and it should probably be encouraged. A unique pointer type for special 
usages, that you can't dereference even by mistake..

But adding a few comments might certainly be worth it. If only to teach 
others the trick.

		Linus
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