The patch titled
Subject: mm: ZONE_DEVICE depends on SPARSEMEM_VMEMMAP
has been added to the -mm tree. Its filename is
mm-zone_device-depends-on-sparsemem_vmemmap.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-zone_device-depends-on-sparsemem_vmemmap.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-zone_device-depends-on-sparsemem_vmemmap.patch
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From: Dan Williams <dan.j.williams@xxxxxxxxx>
Subject: 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: Dan Williams <dan.j.williams@xxxxxxxxx>
Reported-by: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/Kconfig | 1 +
1 file changed, 1 insertion(+)
diff -puN mm/Kconfig~mm-zone_device-depends-on-sparsemem_vmemmap mm/Kconfig
--- a/mm/Kconfig~mm-zone_device-depends-on-sparsemem_vmemmap
+++ a/mm/Kconfig
@@ -653,6 +653,7 @@ config ZONE_DEVICE
bool "Device memory (pmem, etc...) hotplug support" if EXPERT
depends on MEMORY_HOTPLUG
depends on MEMORY_HOTREMOVE
+ depends on SPARSEMEM_VMEMMAP
depends on X86_64 #arch_add_memory() comprehends device memory
help
_
Patches currently in -mm which might be from dan.j.williams@xxxxxxxxx are
list-kill-list_force_poison.patch
mm-fix-mixed-zone-detection-in-devm_memremap_pages.patch
mm-exclude-zone_device-from-gfp_zone_table.patch
mm-zone_device-depends-on-sparsemem_vmemmap.patch
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