diff options
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/memblock.c | 12 | ||||
| -rw-r--r-- | mm/memory_hotplug.c | 1 |
2 files changed, 13 insertions, 0 deletions
diff --git a/mm/memblock.c b/mm/memblock.c index d5681008dce1..6a2a48a122a9 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -39,6 +39,9 @@ struct memblock memblock __initdata_memblock = { }; int memblock_debug __initdata_memblock; +#ifdef CONFIG_MOVABLE_NODE +bool movable_node_enabled __initdata_memblock = false; +#endif static int memblock_can_resize __initdata_memblock; static int memblock_memory_in_slab __initdata_memblock = 0; static int memblock_reserved_in_slab __initdata_memblock = 0; @@ -820,6 +823,11 @@ void __init_memblock __next_free_mem_range(u64 *idx, int nid, * @out_nid: ptr to int for nid of the range, can be %NULL * * Reverse of __next_free_mem_range(). + * + * Linux kernel cannot migrate pages used by itself. Memory hotplug users won't + * be able to hot-remove hotpluggable memory used by the kernel. So this + * function skip hotpluggable regions if needed when allocating memory for the + * kernel. */ void __init_memblock __next_free_mem_range_rev(u64 *idx, int nid, phys_addr_t *out_start, @@ -844,6 +852,10 @@ void __init_memblock __next_free_mem_range_rev(u64 *idx, int nid, if (nid != MAX_NUMNODES && nid != memblock_get_region_node(m)) continue; + /* skip hotpluggable memory regions if needed */ + if (movable_node_is_enabled() && memblock_is_hotpluggable(m)) + continue; + /* scan areas before each reservation for intersection */ for ( ; ri >= 0; ri--) { struct memblock_region *r = &rsv->regions[ri]; diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 489f235502db..01e39afde1cb 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -1446,6 +1446,7 @@ static int __init cmdline_parse_movable_node(char *p) * the kernel away from hotpluggable memory. */ memblock_set_bottom_up(true); + movable_node_enabled = true; #else pr_warn("movable_node option not supported\n"); #endif |