[PATCH 0/3] make pfn walker support ZONE_DEVICE

[Toshiki Fukasawa <t-fukasawa@vx.jp.nec.com>]

This patch set tries to make pfn walker support ZONE_DEVICE.
This idea is from the TODO in below patch:

  commit aad5f69bc161af489dbb5934868bd347282f0764
  Author: David Hildenbrand <david@redhat.com>
  Date:   Fri Oct 18 20:19:20 2019 -0700

	fs/proc/page.c: don't access uninitialized memmaps in fs/proc/page.c

pfn walker's ZONE_DEVICE support requires capability to identify
that a memmap has been initialized. The uninitialized cases are 
as follows:

	a) pages reserved for ZONE_DEVICE driver
	b) pages currently initializing

This patch set solves both of them.

Toshiki Fukasawa (3):
  procfs: refactor kpage_*_read() in fs/proc/page.c
  mm: Introduce subsection_dev_map
  mm: make pfn walker support ZONE_DEVICE

 fs/proc/page.c           | 155 ++++++++++++++++++++---------------------------
 include/linux/memremap.h |   6 ++
 include/linux/mmzone.h   |  19 ++++++
 mm/memremap.c            |  31 ++++++++++
 mm/sparse.c              |  32 ++++++++++
 5 files changed, 154 insertions(+), 89 deletions(-)

-- 
1.8.3.1