linux-kernel - [PATCH 0/2] Protect cpu map updates from ACPI processor

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Message-Id: <1376322354-13026-1-git-send-email-toshi.kani@hp.com>
Date:	Mon, 12 Aug 2013 09:45:52 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	rjw@...k.pl
Cc:	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	srivatsa.bhat@...ux.vnet.ibm.com, isimatu.yasuaki@...fujitsu.com,
	Toshi Kani <toshi.kani@...com>
Subject: [PATCH 0/2] Protect cpu map updates from ACPI processor

CPU system maps are protected with reader/writer locks.  The reader
lock, put_online_cpus(), assures that the maps are not updated while
holding the lock.  The writer lock, cpu_hotplug_begin(), is used to
udpate the cpu maps along with cpu_maps_update_begin().

However, the ACPI processor handler updates the cpu maps without
holding the the writer lock.  This patchset fixes this problem.

---
The patchset is based on linux-next of the pm tree.

---
Toshi Kani (2):
 CPU hotplug: Export cpu_hotplug_begin() interface
 ACPI: Acquire writer lock to update cpu maps

---
 drivers/acpi/acpi_processor.c | 21 ++++++++++++++++-----
 include/linux/cpu.h           |  2 ++
 kernel/cpu.c                  |  4 ++--
 3 files changed, 20 insertions(+), 7 deletions(-)

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