Andrea Arcangeli wrote:

On Tue, Nov 02, 2004 at 05:43:45PM -0800, Dave Hansen wrote:

quoted

Oh, crap.  I meant to clear ->mapped when change_attr(__pgprot(0)) was 
done on it, and set it when it was changed back.  Doing that correctly 
preserves the symmetry, right?

yes it should. I agree with Andrew a bitflag would be enough. I'd call
it PG_prot_none.

It should be enough, but I don't think we want to waste a bitflag for 
something that's only needed for debugging anyway.  They're getting 
precious these days.  Might as well just bloat the kernel some more when 
the alloc debugging is on.

I'll see what I can do to get some backtraces of the __pg_prot(0) &&
page->mapped cases.
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