+ acpimemhotplug-enable-mhp_memmap_on_memory-when-supported.patch added to -mm tree

[akpm@linux-foundation.org]

The patch titled
     Subject: acpi,memhotplug: enable MHP_MEMMAP_ON_MEMORY when supported
has been added to the -mm tree.  Its filename is
     acpimemhotplug-enable-mhp_memmap_on_memory-when-supported.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/acpimemhotplug-enable-mhp_memmap_on_memory-when-supported.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/acpimemhotplug-enable-mhp_memmap_on_memory-when-supported.patch

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------------------------------------------------------
From: Oscar Salvador <osalvador@suse.de>
Subject: acpi,memhotplug: enable MHP_MEMMAP_ON_MEMORY when supported

Let the caller check whether it can pass MHP_MEMMAP_ON_MEMORY by checking
mhp_supports_memmap_on_memory().  MHP_MEMMAP_ON_MEMORY can only be set in
case ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE is enabled, the architecture
supports altmap, and the range to be added spans a single memory block.

Link: https://lkml.kernel.org/r/20210416112411.9826-6-osalvador@suse.de
Signed-off-by: Oscar Salvador <osalvador@suse.de>
Reviewed-by: David Hildenbrand <david@redhat.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/acpi/acpi_memhotplug.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/acpi/acpi_memhotplug.c~acpimemhotplug-enable-mhp_memmap_on_memory-when-supported
+++ a/drivers/acpi/acpi_memhotplug.c
@@ -171,6 +171,7 @@ static int acpi_memory_enable_device(str
 	acpi_handle handle = mem_device->device->handle;
 	int result, num_enabled = 0;
 	struct acpi_memory_info *info;
+	mhp_t mhp_flags = MHP_NONE;
 	int node;
 
 	node = acpi_get_node(handle);
@@ -194,8 +195,10 @@ static int acpi_memory_enable_device(str
 		if (node < 0)
 			node = memory_add_physaddr_to_nid(info->start_addr);
 
+		if (mhp_supports_memmap_on_memory(info->length))
+			mhp_flags |= MHP_MEMMAP_ON_MEMORY;
 		result = __add_memory(node, info->start_addr, info->length,
-				      MHP_NONE);
+				      mhp_flags);
 
 		/*
 		 * If the memory block has been used by the kernel, add_memory()
_

Patches currently in -mm which might be from osalvador@suse.de are

x86-vmemmap-drop-handling-of-4k-unaligned-vmemmap-range.patch
x86-vmemmap-drop-handling-of-1gb-vmemmap-ranges.patch
x86-vmemmap-handle-unpopulated-sub-pmd-ranges.patch
x86-vmemmap-handle-unpopulated-sub-pmd-ranges-fix.patch
x86-vmemmap-optimize-for-consecutive-sections-in-partial-populated-pmds.patch
drivers-base-memory-introduce-memory_block_onlineoffline.patch
mmmemory_hotplug-relax-fully-spanned-sections-check.patch
mmmemory_hotplug-allocate-memmap-from-the-added-memory-range.patch
acpimemhotplug-enable-mhp_memmap_on_memory-when-supported.patch
mmmemory_hotplug-add-kernel-boot-option-to-enable-memmap_on_memory.patch
x86-kconfig-introduce-arch_mhp_memmap_on_memory_enable.patch
arm64-kconfig-introduce-arch_mhp_memmap_on_memory_enable.patch