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    SubjectRe: [PATCH] x86 page fault handler not interrupt safe
    > Alan Cox wrote:
    > > (The current -ac fix for the double vmalloc races is below. WP test makes it
    > > more complex than is nice)
    > WP test is easy to handle. Just filter out protection violations and
    > only take the vmalloc path if the page was not found.
    > - if (address >= TASK_SIZE && !(error_code & 4))
    > + if (address >= TASK_SIZE && !(error_code & 5))

    That is nice. I hadn't thought about doing it that way. It still has the problem
    if %cr2 is corrupted by a vmalloc fault but it cleans up my other code paths


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