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    SubjectRe: [PATCH] x86: fix ref-counting bug in change_page_attr()

    * Jan Beulich <> wrote:

    > When either calling change_page_attr() with the default attributes
    > pages in the direct mapping have and a page's attributes already were
    > set to the default or when changing the attributes from one
    > non-default value to another, the reference counting broke, leading to
    > either premature restoration of a large page or missing the
    > opportunity to do so.
    > At the same time, make __PHYSICAL_MASK_SHIFT on 64-bits the value it
    > architecturally ought to have.

    hm, does this patch fix any real bug seen live? (if yes then do you have
    links to it, etc?) It would be a v2.6.24 fix in theory but it looks too
    dangerous for that. So i've queued it up for v2.6.25, for the time


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