On Fri, 28 Mar 2008, Linus Torvalds wrote:
quoted text
> 
> It would be better if we actually passed in the gfp_flags, and then we 
> could test the __GFP_HIGH bit rather than the page address.  But for now, 
> the rule is that GFP_ATOMIC and __GFP_ZERO do not work together, because 
> this sanity test currently cannot work for that case.

Gaah. Sadly, we don't actually have any reasonably sane way of doing that. 

So I guess we'll have to lose the coverage of kmap_atomic() in other 
places, even though the only case where this was worth losing it for was 
that one clear_highpage() call site :/

		Linus
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