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Subject[RFC PATCH v2 1/4] mm,memory_hotplug: Introduce MHP_MEMMAP_ON_MEMORY
Date
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@suse.de>
---
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
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