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@xxxxxxxxxx> 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
