Please consider the following patches for the 2.6.27 stable tree.
The first two allow a powerpc machine with more then 2 numa nodes
to boot when 16G pages are enabled. The third one allows a powerpc
machine to boot if using 16G pages and the mem= boot param.
thanks,
Jon
powerpc: Reserve in bootmem lmb reserved regions that cross NUMA nodes
commit 8f64e1f2d1e09267ac926e15090fd505c1c0cbcb
powerpc/numa: Make memory reserve code more robust
commit e81703724a966120ace6504c993bda9e084cbf3e
powerpc: Don't use a 16G page if beyond mem= limits
commit 4792adbac9eb41cea77a45ab76258ea10d411173
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