Memory-hotplug codes for x86_64 have been implemented by patchset: https://lkml.org/lkml/2013/1/9/124 While other platforms haven't been completely implemented yet. If we enable both CONFIG_MEMORY_HOTPLUG_SPARSE and CONFIG_SPARSEMEM_VMEMMAP, register_page_bootmem_info_node() may be buggy, which is a hotplug generic function but falling back to call platform related function register_page_bootmem_memmap(). Other platforms such as powerpc it's not implemented, so on such platforms, revert them as empty as they were before. Reported-by: Michal Hocko <mhocko@xxxxxxx> Signed-off-by: Lin Feng <linfeng@xxxxxxxxxxxxxx> --- mm/memory_hotplug.c | 9 +++++++++ 1 files changed, 9 insertions(+), 0 deletions(-) diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 8aa2b56..bd93c2e 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -189,6 +189,7 @@ static void register_page_bootmem_info_section(unsigned long start_pfn) } #endif +#ifdef CONFIG_X86_64 void register_page_bootmem_info_node(struct pglist_data *pgdat) { unsigned long i, pfn, end_pfn, nr_pages; @@ -230,6 +231,14 @@ void register_page_bootmem_info_node(struct pglist_data *pgdat) register_page_bootmem_info_section(pfn); } } +#else +static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) +{ + /* + * Todo: platforms other than X86_64 haven't been implemented yet. + */ +} +#endif static void grow_zone_span(struct zone *zone, unsigned long start_pfn, unsigned long end_pfn) -- 1.7.1 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>