Excerpts from Li Zefan's message of 2011-02-16 01:06:41 -0500:
> When decompressing a chunk of data, we'll copy the data out to
> a working buffer if the data is stored in more than one page,
> otherwise we'll use the mapped page directly to avoid memory
> copy.
> 
> In the latter case, we'll end up accessing the kernel address
> after we've unmapped the page in a corner case.

Great, thanks I've got this running here now.

-chris
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