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    SubjectRe: [PATCH] [5/8] Fix logic error in 64bit memory hotadd

    * Andi Kleen <> wrote:

    > > Also, your fix, while it solves a real bug we want to fix, is not quite
    > > right for upstream integration yet. I can see 3 immediate problems with
    > > it:
    > >
    > > > + if (!pud_present(*pud)) {
    > > > + pud = (pud_t *)get_zeroed_page(GFP_ATOMIC);
    > >
    > > the GFP_ATOMIC here can fail.
    > The memory hotplug code already uses GFP_ATOMIC elsewhere
    > (spp_getpage)

    wrong. The _x86_ memory hotplug code uses GFP_ATOMIC elsewhere.
    The generic memory hotplug code does not.

    and the x86 memory hotplug code uses GFP_ATOMIC and panic() elsewhere

    > The existing code already panics elsewhere (spp_getpage); i just
    > copied that.

    and you had nothing to do with that "existing code"? git-log reveals
    that the GFP_ATOMIC and panic()-ing patch was added 2 years ago and was
    signed off by you:

    commit 44df75e629106efcada087cead6c3f33ed6bcc60
    Author: Matt Tolentino <>
    Date: Tue Jan 17 07:03:41 2006 +0100

    [PATCH] x86_64: add x86-64 support for memory hot-add

    Signed-off-by: Andi Kleen <>

    We (like most upstream kernel subsystems) generally do not accept
    patches into arch/x86 that spreads a buggy implementation detail
    further. Please submit a patch that cleans up the mess. Thanks,


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