From 421c175c4d609864350df495b34d3e99f9fb1bdd Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Mon, 14 Jul 2008 09:59:18 +0200 Subject: [S390] Add support for memory hot-add. Cc: Gerald Schaefer Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- arch/s390/Kconfig | 4 ++++ arch/s390/mm/init.c | 19 +++++++++++++++++++ 2 files changed, 23 insertions(+) (limited to 'arch/s390') diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index 6d0d31651f0..5dc8f8028d5 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -313,6 +313,10 @@ config ARCH_SPARSEMEM_DEFAULT config ARCH_SELECT_MEMORY_MODEL def_bool y +config ARCH_ENABLE_MEMORY_HOTPLUG + def_bool y + depends on SPARSEMEM + source "mm/Kconfig" comment "I/O subsystem configuration" diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c index 05598649b32..388cc742005 100644 --- a/arch/s390/mm/init.c +++ b/arch/s390/mm/init.c @@ -202,3 +202,22 @@ void free_initrd_mem(unsigned long start, unsigned long end) } } #endif + +#ifdef CONFIG_MEMORY_HOTPLUG +int arch_add_memory(int nid, u64 start, u64 size) +{ + struct pglist_data *pgdat; + struct zone *zone; + int rc; + + pgdat = NODE_DATA(nid); + zone = pgdat->node_zones + ZONE_NORMAL; + rc = vmem_add_mapping(start, size); + if (rc) + return rc; + rc = __add_pages(zone, PFN_DOWN(start), PFN_DOWN(size)); + if (rc) + vmem_remove_mapping(start, size); + return rc; +} +#endif /* CONFIG_MEMORY_HOTPLUG */ -- cgit v1.2.3-70-g09d2