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    SubjectRe: sparc64 bootup regression...
    On Thu, 8 May 2008 00:09:45 +0200
    "Rafael J. Wysocki" <rjw@sisk.pl> wrote:

    > On Wednesday, 30 of April 2008, Andrew Morton wrote:
    > > On Tue, 29 Apr 2008 23:12:41 -0700 (PDT) David Miller <davem@davemloft.net> wrote:
    > >
    > > >
    > > > This commit causes bootup failures on sparc64:
    > > >
    > > > commit 86f6dae1377523689bd8468fed2f2dd180fc0560
    > > > Author: Yasunori Goto <y-goto@jp.fujitsu.com>
    > > > Date: Mon Apr 28 02:13:33 2008 -0700
    > > >
    > > > memory hotplug: allocate usemap on the section with pgdat
    > > >
    > > > Usemaps are allocated on the section which has pgdat by this.
    > > >
    > > > Because usemap size is very small, many other sections usemaps are allocated
    > > > on only one page. If a section has usemap, it can't be removed until removing
    > > > other sections. This dependency is not desirable for memory removing.
    > > >
    > > > Pgdat has similar feature. When a section has pgdat area, it must be the last
    > > > section for removing on the node. So, if section A has pgdat and section B
    > > > has usemap for section A, Both sections can't be removed due to dependency
    > > > each other.
    > > >
    > > > To solve this issue, this patch collects usemap on same section with pgdat.
    > > > If other sections doesn't have any dependency, this section will be able to be
    > > > removed finally.
    > >
    > > Thanks. Does a straightforward revert fix it? If so, we could do that while heads
    > > are being scratched.
    >
    > Has that been reverted already?

    yes, it has.

    commit 5167464446e527b5a3b5618ba0baff93048bcbbe
    Author: Andrew Morton <akpm@linux-foundation.org>
    Date: Wed Apr 30 00:55:17 2008 -0700

    revert "memory hotplug: allocate usemap on the section with pgdat"



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