[PATCH v1 0/3] mm: fix max_pfn not falling on section boundary

From: David Hildenbrand
Date: Mon Dec 09 2019 - 12:48:51 EST

Playing with different memory sizes for a x86-64 guest, I discovered that
some memmaps (highest section if max_mem does not fall on the section
boundary) are marked as being valid and online, but contain garbage. We
have to properly initialize these memmaps.

Looking at /proc/kpageflags and friends, I found some more issues,
partially related to this.

David Hildenbrand (3):
mm: fix uninitialized memmaps on a partially populated last section
fs/proc/page.c: allow inspection of last section and fix end detection
mm: initialize memmap of unavailable memory directly

fs/proc/page.c | 15 ++++++++++++---
include/linux/mm.h | 6 ------
mm/page_alloc.c | 43 ++++++++++++++++++++++++++++++++-----------
3 files changed, 44 insertions(+), 20 deletions(-)