2.6.23-rc1-mm1: boot hang on ia64 with memoryless nodes

[Lee Schermerhorn <Lee.Schermerhorn@hp.com>]

On Wed, 2007-07-25 at 11:45 -0400, Lee Schermerhorn wrote:
<snip>

> 2) fails to boot with:
> 
> Unable to handle kernel paging request at virtual address a000400002000020
> swapper[0]: Oops 11003706212352 [1]
> Modules linked in:
> 
> Pid: 0, CPU 0, comm:              swapper
> psr : 00001210084a2010 ifs : 8000000000000995 ip  : [<a0000001008a4df1>]    Not tainted
> ip is at memmap_init_zone+0x271/0x2a0
<snip>
> 
> ... then hard hang.

I tried Mel Gormans ia64 memmap corruption patches [the ones that aren't
already in 23-rc1-mm1--looks like the original one is?], and see the
same thing.

I tried to deselect SPARSEMEM_VMEMMAP.  Kconfig's "def_bool=y" wouldn't
let me :-(.  After hacking the Kconfig and mm/sparse.c to allow that,
boot hangs with no error messages shortly after "Built N zonelists..."
message.

Backed off to DISCONTIGMEM+VIRTUAL_MEMORY_MAP, and saw same hang as with
(SPARSMEM && !SPARSEMEM_VMEMMAP).   

I should mention that I have my test system in the "fully interleaved"
configuration for testing the memoryless node patches.  This means that
nodes 0-3 [the real nodes with the cpus attached] have no memory.  All
memory resides in a cpu-less pseudo-node.  I'm wondering if
SPARSEMEM_VMEMMAP can handle this?  22-rc6-mm1 booted OK on this config
w/ SPARSEMEM_EXTREME.

Lee

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