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    SubjectRe: mlockall and mmap of IO devices don't mix
    Mark Hounschell <markh@compro.net> wrote:
    >
    > Joe Korty wrote:
    > >
    > > 2.6.0-test6: the use of mlockall(2) in a process that has mmap(2)ed
    > > the registers of an IO device will hang that process uninterruptibly.
    > > The task runs in an infinite loop in get_user_pages(), invoking
    > > follow_page() forever.
    > >
    > > Using binary search I discovered that the problem was introduced
    > > in 2.5.14, specifically in ChangeSetKey
    > >
    > > zippel@linux-m68k.org|ChangeSet|20020503210330|37095
    > >
    >
    > I know this is an old thread but can anyone tell me if this problem is
    > resolved in the current 2.6.6 kernel?
    >

    There's an utterly ancient patch in -mm which might fix this.

    http://www.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.6/2.6.6-mm4/broken-out/get_user_pages-handle-VM_IO.patch

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