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

Message

David Hildenbrand Dec. 9, 2019, 5:48 p.m. UTC

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(-)