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    SubjectRe: [PATCH 03/11] x86/mm/hotplug: Don't remove PGD entries in remove_pagetable()
    On Fri, Feb 12, 2016 at 11:04 AM, Andy Lutomirski <luto@amacapital.net> wrote:
    > On Mon, Sep 21, 2015 at 11:23 PM, Ingo Molnar <mingo@kernel.org> wrote:
    >> So when memory hotplug removes a piece of physical memory from pagetable
    >> mappings, it also frees the underlying PGD entry.
    >>
    >> This complicates PGD management, so don't do this. We can keep the
    >> PGD mapped and the PUD table all clear - it's only a single 4K page
    >> per 512 GB of memory hotplugged.
    >
    > Ressurecting an ancient thread: I want this particular change to make
    > it (much) easier to make vmapped stacks work correctly. Could it be
    > applied by itself?
    >

    It's incomplete. pageattr.c has another instance of the same thing.
    I'll see if I can make it work, but I may end up doing something a
    little different.

    --Andy

    --
    Andy Lutomirski
    AMA Capital Management, LLC

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