]> git.baikalelectronics.ru Git - kernel.git/commit
mm: ZONE_DEVICE depends on SPARSEMEM_VMEMMAP
authorDan Williams <dan.j.williams@intel.com>
Thu, 17 Mar 2016 21:19:58 +0000 (14:19 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 17 Mar 2016 22:09:34 +0000 (15:09 -0700)
commit30c7671abac8192c4726f7b3dafd1c284eefff1b
treeebf6784f883a2b791d51366ecb18b0dbdf3f3029
parent6e39479615996c60f1a116b5d7ff595ec8be4dda
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>
mm/Kconfig