Dave, The following patch is necessary for memory hot add on ppc64 in a DLPAR environment. I still need to do some additional work to make sure the memory really is there before creating the mappings. Also, I want to do some cleanup in the cases where memory block size does not equal section size. In any case, the following is needed for anyone playing with ppc64. -- Signed-off-by: Mike Kravetz Signed-off-by: Dave Hansen --- memhotplug-dave/arch/ppc64/mm/hash_utils.c | 7 +++++++ memhotplug-dave/arch/ppc64/mm/init.c | 3 +++ 2 files changed, 10 insertions(+) diff -puN arch/ppc64/mm/hash_utils.c~G3-ppc64-create-mappings arch/ppc64/mm/hash_utils.c --- memhotplug/arch/ppc64/mm/hash_utils.c~G3-ppc64-create-mappings 2005-04-13 14:20:54.000000000 -0700 +++ memhotplug-dave/arch/ppc64/mm/hash_utils.c 2005-04-13 14:20:54.000000000 -0700 @@ -143,6 +143,13 @@ static inline void create_pte_mapping(un } } +void create_lmb_mapping(unsigned long start, unsigned long end) +{ + create_pte_mapping(start, end, + _PAGE_ACCESSED | _PAGE_COHERENT | PP_RWXX, + cur_cpu_spec->cpu_features & CPU_FTR_16M_PAGE ? 1 : 0); +} + void __init htab_initialize(void) { unsigned long table, htab_size_bytes; diff -puN arch/ppc64/mm/init.c~G3-ppc64-create-mappings arch/ppc64/mm/init.c --- memhotplug/arch/ppc64/mm/init.c~G3-ppc64-create-mappings 2005-04-13 14:20:54.000000000 -0700 +++ memhotplug-dave/arch/ppc64/mm/init.c 2005-04-13 14:20:54.000000000 -0700 @@ -963,6 +963,9 @@ int __devinit add_memory(u64 start, u64 unsigned long start_pfn = start >> PAGE_SHIFT; unsigned long nr_pages = size >> PAGE_SHIFT; + start += KERNELBASE; + create_lmb_mapping(start, start + size); + /* this should work for most non-highmem platforms */ zone = pgdata->node_zones; _