MHP_MEMMAP_ON_MEMORY tells the system that we want the memmap pagetables to be built from the hot-added range. Signed-off-by: Oscar Salvador <osalvador@xxxxxxx> --- include/linux/memory_hotplug.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h index 551093b74596..5b1ea1f8d1ab 100644 --- a/include/linux/memory_hotplug.h +++ b/include/linux/memory_hotplug.h @@ -70,6 +70,14 @@ typedef int __bitwise mhp_t; */ #define MEMHP_MERGE_RESOURCE ((__force mhp_t)BIT(0)) +/* + * We want memmap (struct page array) to be self contained. + * To do so, we will use the beginning of the hot-added range to build + * the page tables for the memmap array that describes the entire range. + * Only selected architectures support it with SPARSE_VMEMMAP. + */ +#define MHP_MEMMAP_ON_MEMORY ((__force mhp_t)BIT(1)) + /* * Extended parameters for memory hotplug: * altmap: alternative allocator for memmap array (optional) -- 2.26.2
