On Fri, 23 May 2008, Paul Mundt wrote:

quoted text
> Ah, so it does. In that case, we still need to kill off the page->index
> BUG_ON() bits, while PageCompound() will take care of the compound order
> bits that the page->index shifting seems to have been trying to
> implement, the BUG_ON() will still trigger for PAGE_SIZE page cache
> pages.

Yes. I have no idea what the page->index check does there. The compound 
page order is not stored in the index field.
 
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