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| author | Dan Williams <dan.j.williams@intel.com> | 2016-03-17 14:19:58 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-03-17 15:09:34 -0700 |
| commit | 99490f16f8b287a028306e4092cc85393907075f (patch) | |
| tree | ebf6784f883a2b791d51366ecb18b0dbdf3f3029 | |
| parent | 0e8fb9312fbaf1a687dd731b04d8ab3121c4ff5a (diff) | |
| download | lwn-99490f16f8b287a028306e4092cc85393907075f.tar.gz lwn-99490f16f8b287a028306e4092cc85393907075f.zip | |
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/Kconfig | 1 |
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 help |