On Wed 25-11-20 12:20:45, Oscar Salvador wrote: > 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> This should be folded into the patch which uses the flag. > --- > 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 -- Michal Hocko SUSE Labs
