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    SubjectRe: oops if free a locked page

    On Tue, 22 Jun 1999, Andrea Arcangeli wrote:

    > On Tue, 22 Jun 1999, Ingo Molnar wrote:
    >
    > >calling __free_page() with a locked page is fine though - but it must not
    > >be the 'final' free.
    >
    > In some SMP-threaded envinronment you can't know if it is the `final'
    > free.

    i made this mistake as well - until Linus pointed out the fact that
    pagecache get_page()/put_page() are naturally synchronized by the
    pagecache spinlock and the combination of page->inode. Buffer-cache pages
    are synchronized by the kernel lock and the existence of page->buffers.
    [or whatever native buffer-cache lock there is]

    normal 'free floating' pages might indeed go away unexpectedly, but
    shrink_mmap() should not deal with such pages .. unless you do something
    unusual.

    -- mingo


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