linux-kernel - [PATCH 0/2] Hibernate fixes for 'Fix memmap to be initialized for the entire section'

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Date:   Fri,  2 Dec 2016 14:49:07 +0000
From:   James Morse <james.morse@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     Robert Richter <rrichter@...ium.com>,
        Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        David Daney <david.daney@...ium.com>,
        Mark Rutland <mark.rutland@....com>,
        Hanjun Guo <hanjun.guo@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] Hibernate fixes for 'Fix memmap to be initialized for the entire section'

Patch "arm64: mm: Fix memmap to be initialized for the entire section"
changes pfn_valid() in a way that breaks hibernate. These patches fix
hibernate, and provided struct page's are allocated for nomap pages,
can be applied before [0].

Hibernate core code belives 'valid' to mean "I can access this". It
uses pfn_valid() to test the page if the page is 'valid'.

pfn_valid() needs to be changed so that all struct pages in a numa
node have the same node-id. Currently 'nomap' pages are skipped, and
retain their pre-numa node-ids, which leads to a later BUG_ON().

These patches make hibernate's savable_page() take its escape route
via 'if (PageReserved(page) && pfn_is_nosave(pfn))'.

[0] https://lkml.org/lkml/2016/11/30/566

James Morse (2):
  arm64: mm: Mark nomap regions with the PG_reserved flag
  arm64: hibernate: report nomap regions as being pfn_nosave

 arch/arm64/kernel/hibernate.c |  6 +++++-
 arch/arm64/mm/init.c          | 14 ++++++++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

-- 
2.10.1