Re: sparc64 bootup regression...

From: Andrew Morton
Date: Wed Apr 30 2008 - 02:38:46 EST


On Tue, 29 Apr 2008 23:12:41 -0700 (PDT) David Miller <davem@xxxxxxxxxxxxx> wrote:

>
> This commit causes bootup failures on sparc64:
>
> commit 86f6dae1377523689bd8468fed2f2dd180fc0560
> Author: Yasunori Goto <y-goto@xxxxxxxxxxxxxx>
> 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.
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