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authorDan Williams <dan.j.williams@intel.com>2016-03-18 00:19:58 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-03-18 01:09:34 +0300
commit99490f16f8b287a028306e4092cc85393907075f (patch)
treeebf6784f883a2b791d51366ecb18b0dbdf3f3029
parent0e8fb9312fbaf1a687dd731b04d8ab3121c4ff5a (diff)
downloadlinux-99490f16f8b287a028306e4092cc85393907075f.tar.xz
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@intel.com> Reported-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/Kconfig1
1 files changed, 1 insertions, 0 deletions
diff --git a/mm/Kconfig b/mm/Kconfig
index 520dae6e6ed0..05efa6a5199e 100644
--- a/mm/Kconfig
+++ b/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
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