linux-kernel - [PATCH 0/2] devm_memremap_pages vs section-misaligned pmem

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Date:	Mon, 29 Feb 2016 18:56:20 -0800
From:	Dan Williams <dan.j.williams@...el.com>
To:	linux-nvdimm@...ts.01.org
Cc:	linux-mm@...ck.org, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] devm_memremap_pages vs section-misaligned pmem

Recent testing uncovered two bugs around the handling of section-misaligned
pmem regions:

1/ If the pmem section overlaps "System RAM" we need to fail the
   devm_memremap_pages() request.  Previously we would mis-detect a
   memory map like the following:

	100000000-37bffffff : System RAM
	37c000000-837ffffff : Persistent Memory

2/ If the pmem section is misaligned, but otherwise does not overlap
   memory from another zone, the altmap needs to be fixed up to add the
   alignment padding to the 'reserved ' pfns of the altmap.

---

Dan Williams (2):
      libnvdimm, pmem: fix 'pfn' support for section-misaligned namespaces
      mm: fix mixed zone detection in devm_memremap_pages

 drivers/nvdimm/pmem.c |   29 +++++++++++++++++++++++++++--
 kernel/memremap.c     |    9 ++++-----
 2 files changed, 31 insertions(+), 7 deletions(-)