linux-kernel - [PATCH v2 0/3] mm: fix max_pfn not falling on section boundary

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Message-Id: <20191211163201.17179-1-david@redhat.com>
Date:   Wed, 11 Dec 2019 17:31:58 +0100
From:   David Hildenbrand <david@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, David Hildenbrand <david@...hat.com>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Bob Picco <bob.picco@...cle.com>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Michal Hocko <mhocko@...nel.org>,
        Michal Hocko <mhocko@...e.com>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        Oscar Salvador <osalvador@...e.de>,
        Pavel Tatashin <pasha.tatashin@...cle.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Steven Sistare <steven.sistare@...cle.com>
Subject: [PATCH v2 0/3] mm: fix max_pfn not falling on section boundary

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.

v1 -> v2:
- "mm: fix uninitialized memmaps on a partially populated last section"
-- Refine patch description (esp. how to reproduce), add tested-by
- "fs/proc/page.c: allow inspection of last section and fix end detection"
-- Make it compile for !CONFIG_SPARSE and add a comment to the new
   helper function

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     | 30 +++++++++++++++++++++++++++---
 include/linux/mm.h |  6 ------
 mm/page_alloc.c    | 43 ++++++++++++++++++++++++++++++++-----------
 3 files changed, 59 insertions(+), 20 deletions(-)

-- 
2.23.0