linux-kernel - [PATCH 0/2] fix devm_memremap

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Message-ID: <148693885124.16345.14319993365448440148.stgit@dwillia2-desk3.amr.corp.intel.com>
Date:   Sun, 12 Feb 2017 14:34:11 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     akpm@...ux-foundation.org
Cc:     Michal Hocko <mhocko@...e.com>, Toshi Kani <toshi.kani@....com>,
        Ben Hutchings <ben@...adent.org.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-nvdimm@...ts.01.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, Logan Gunthorpe <logang@...tatee.com>,
        Vlastimil Babka <vbabka@...e.cz>
Subject: [PATCH 0/2] fix devm_memremap_pages() mem hotplug locking

Ben notes that commit f931ab479dd2 "mm: fix devm_memremap_pages crash,
use mem_hotplug_{begin, done}" is incomplete and broken. Writes to
mem_hotplug.active_writer need to be coordinated under the device
hotplug lock. Otherwise, we can potentially corrupt mem_hotplug.refcount
leading to soft lockups.

---

Dan Williams (2):
      mm, devm_memremap_pages: hold device_hotplug lock over mem_hotplug_{begin,done}
      mm: validate device_hotplug is held for memory hotplug


 drivers/base/core.c    |    5 +++++
 include/linux/device.h |    1 +
 kernel/memremap.c      |    5 +++++
 mm/memory_hotplug.c    |    2 ++
 4 files changed, 13 insertions(+)