diff options
Diffstat (limited to 'mm/memory_hotplug.c')
| -rw-r--r-- | mm/memory_hotplug.c | 42 |
1 files changed, 35 insertions, 7 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index a86a66cbef77..82d0b98d27f8 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -1047,6 +1047,37 @@ static void node_states_set_node(int node, struct memory_notify *arg) node_set_state(node, N_MEMORY); } +int zone_can_shift(unsigned long pfn, unsigned long nr_pages, + enum zone_type target) +{ + struct zone *zone = page_zone(pfn_to_page(pfn)); + enum zone_type idx = zone_idx(zone); + int i; + + if (idx < target) { + /* pages must be at end of current zone */ + if (pfn + nr_pages != zone_end_pfn(zone)) + return 0; + + /* no zones in use between current zone and target */ + for (i = idx + 1; i < target; i++) + if (zone_is_initialized(zone - idx + i)) + return 0; + } + + if (target < idx) { + /* pages must be at beginning of current zone */ + if (pfn != zone->zone_start_pfn) + return 0; + + /* no zones in use between current zone and target */ + for (i = target + 1; i < idx; i++) + if (zone_is_initialized(zone - idx + i)) + return 0; + } + + return target - idx; +} /* Must be protected by mem_hotplug_begin() */ int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_type) @@ -1072,13 +1103,10 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_typ !can_online_high_movable(zone)) return -EINVAL; - if (online_type == MMOP_ONLINE_KERNEL && - zone_idx(zone) == ZONE_MOVABLE) - zone_shift = -1; - - if (online_type == MMOP_ONLINE_MOVABLE && - zone_idx(zone) == ZONE_MOVABLE - 1) - zone_shift = 1; + if (online_type == MMOP_ONLINE_KERNEL) + zone_shift = zone_can_shift(pfn, nr_pages, ZONE_NORMAL); + else if (online_type == MMOP_ONLINE_MOVABLE) + zone_shift = zone_can_shift(pfn, nr_pages, ZONE_MOVABLE); zone = move_pfn_range(zone_shift, pfn, pfn + nr_pages); if (!zone) |