Re: [PATCH 2.5.66-mm2] Fix page_convert_anon locking issues

[Dave McCracken <dmccr@us.ibm.com>]

--On Wednesday, April 02, 2003 17:58:08 -0600 Dave McCracken
<dmccr@us.ibm.com> wrote:

> It's looking more and more like we should use your other suggestion.  It's
> definitely simpler if we can make it failsafe.  I'll code it up tomorrow.

I thought of a big hole in the simpler scheme you suggested.  It occurred
to me that try_to_unmap will fail.  It will see the PageAnon flag so it'll
just walk the pte_chain and assume it doesn't have to walk the vmas.  This
will leave the page with some stranded mappings.  Actually
page_convert_anon will then finish, and we'll have a page where
try_to_unmap claims it has succeeded but still has mappings.

Dave McCracken

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