Commit 99490f16 authored by Dan Williams's avatar Dan Williams Committed by Linus Torvalds

mm: ZONE_DEVICE depends on SPARSEMEM_VMEMMAP

The primary use case for devm_memremap_pages() is to allocate an memmap
array from persistent memory.  That capabilty requires vmem_altmap which
requires SPARSEMEM_VMEMMAP.

Also, without SPARSEMEM_VMEMMAP the addition of ZONE_DEVICE expands
ZONES_WIDTH and triggers the:

"Unfortunate NUMA and NUMA Balancing config, growing page-frame for
last_cpupid."

...warning in mm/memory.c.  SPARSEMEM_VMEMMAP=n && ZONE_DEVICE=y is not
a configuration we should worry about supporting.
Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
Reported-by: default avatarVlastimil Babka <vbabka@suse.cz>
Acked-by: default avatarVlastimil Babka <vbabka@suse.cz>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 0e8fb931
...@@ -653,6 +653,7 @@ config ZONE_DEVICE ...@@ -653,6 +653,7 @@ config ZONE_DEVICE
bool "Device memory (pmem, etc...) hotplug support" if EXPERT bool "Device memory (pmem, etc...) hotplug support" if EXPERT
depends on MEMORY_HOTPLUG depends on MEMORY_HOTPLUG
depends on MEMORY_HOTREMOVE depends on MEMORY_HOTREMOVE
depends on SPARSEMEM_VMEMMAP
depends on X86_64 #arch_add_memory() comprehends device memory depends on X86_64 #arch_add_memory() comprehends device memory
help help
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