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/20210421102701.25051-6-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: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
index b02fd51..8cc195c 100644 (file)
--- a/drivers/acpi/acpi_memhotplug.c
+++ b/drivers/acpi/acpi_memhotplug.c
@@ -171,6 +171,7 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
        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(struct acpi_memory_device *mem_device)
                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()