linux-kernel - [PATCH 0/2] Add exit_prepare callback to the cpufreq

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Message-Id: <1394732168-12638-1-git-send-email-dirk.j.brandewie@intel.com>
Date:	Thu, 13 Mar 2014 10:36:06 -0700
From:	dirk.brandewie@...il.com
To:	linux-pm@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, rjw@...ysocki.net,
	patrick.marlier@...il.com, dirk.brandewie@...il.com,
	Dirk Brandewie <dirk.j.brandewie@...el.com>
Subject: [PATCH 0/2] Add exit_prepare callback to the cpufreq_driver interface.

From: Dirk Brandewie <dirk.j.brandewie@...el.com>

Some drivers (intel_pstate) need to modify state on a core before it
is completely offline.  The ->exit() callback is executed during the
CPU_POST_DEAD phase of the cpu offline process which is too late to
change the state of the core.

Patch 1 adds an optional callback function to the cpufreq_driver
interface which is called by the core during the CPU_DOWN_PREPARE
phase of cpu offline in __cpufreq_remove_dev_prepare().

Patch 2 changes intel_pstate to use the ->exit_prepare callback to do
its cleanup during cpu offline. 

Dirk Brandewie (2):
  cpufreq: Add exit_prepare callback to cpufreq_driver interface
  intel_pstate: Set core to min P state during core offline

 Documentation/cpu-freq/cpu-drivers.txt |  8 +++++++-
 drivers/cpufreq/cpufreq.c              |  3 +++
 drivers/cpufreq/intel_pstate.c         | 20 +++++++++++++-------
 include/linux/cpufreq.h                |  1 +
 4 files changed, 24 insertions(+), 8 deletions(-)

-- 
1.8.3.1

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