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    SubjectRe: [PATCH] SPARSEMEM + NUMA can't handle unaligned memory regions?
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    On Tue, 2006-05-09 at 09:32 +0100, Andy Whitcroft wrote:
    > Michael Ellerman wrote:
    > > I can't believe I'm the first person to see this, so I imagine I'm missing
    > > something. Perhaps it's only an issue on powerpc?
    > >
    > > I have a machine with some memory at 0, then a hole, and then some more memory
    > > which doesn't start on a section boundary. This is causing the following
    > > crash:
    > >
    > > add_region nid 1 start_pfn 0x77c0 pages 0x840
    > > add_region nid 1 start_pfn 0x0 pages 0x6000
    >
    > Nasty, could you send me your full boot log and your config and I'll
    > have a look at it. I can say this code has been booted on a lot of
    > power boxes and I've never seen that before! :)

    Ah yeah, I seem to have neglected to mention it's a kdump boot :} Sorry.
    That's why we get the strangely aligned memory sections. The section
    starting at 0 is for the kdump kernel, the bit at 0x77c0 covers some
    firmware that's allocated there by the first kernel.

    I can still give you a .config and log if you want it, but not 'til
    tomorrow morning.

    > Anyhow, will take a look and see if we can avoid iterating over the area
    > to find it.

    Yeah it's a bit nasty having the loop. I figure on most configs it'll
    pop on the first iteration, but still.

    cheers

    --
    Michael Ellerman
    IBM OzLabs

    wwweb: http://michael.ellerman.id.au
    phone: +61 2 6212 1183 (tie line 70 21183)

    We do not inherit the earth from our ancestors,
    we borrow it from our children. - S.M.A.R.T Person
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