linux-kernel - [PATCH v4 0/5] Simplify hotplug/suspend handling

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Date:	Thu, 24 Jul 2014 18:07:23 -0700
From:	Saravana Kannan <skannan@...eaurora.org>
To:	"Rafael J . Wysocki" <rjw@...ysocki.net>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Todd Poynor <toddpoynor@...gle.com>,
	"Srivatsa S . Bhat" <srivatsa@....edu>
Cc:	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	"Saravana Kannan" <skannan@...eaurora.org>,
	Stephen Boyd <sboyd@...eaurora.org>
Subject: [PATCH v4 0/5] Simplify hotplug/suspend handling

Series of patchs to simplify policy/sysfs/kobj/locking handling across
suspend/resume

The following have been tested so far on a 2x2 cluster environment:
- Boot with 2 cpus and no cpufreq driver.
- mod probe driver and see cpufreq sysfs files show up only for the 1st cluster.
- Online the rest of the 2 CPUs and have files show up correctly.
- rmmod the driver and see the files go away.
- modprobe again (or back and forth multiples times) and see it work.
- suspend/resume works as expected.
- When a cluster is offline, all read/writes to its sysfs files return an error

v4
- Split it up into smaller patches
- Will handle physical CPU removal correctly
- Fixed earlier mistake of deleting code under !recover_policy
- Dropped some code refactor that reuses a lot of code between add/remove
- Dropped fix for exiting hotplug race with cpufreq driver probe/rmmod
- Dropped changes will come later once this series is acked.


Saravana Kannan (5):
  cpufreq: Don't wait for CPU to going offline to restart governor
  cpufreq: Keep track of which CPU owns the kobj/sysfs nodes separately
  cpufreq: Don't destroy/realloc policy/sysfs on hotplug/suspend
  cpufreq: Properly handle physical CPU hot-add/hot-remove
  cpufreq: Delete dead code related to policy save/restore

 drivers/cpufreq/cpufreq.c | 238 ++++++++++++++++++----------------------------
 include/linux/cpufreq.h   |   1 +
 2 files changed, 93 insertions(+), 146 deletions(-)

-- 
1.8.2.1

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