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(-) -- 2.21.0
