From: Viresh Kumar <viresh.kumar@linaro.org>
To: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>
Cc: Juri Lelli <juri.lelli@arm.com>,
Rafael Wysocki <rjw@rjwysocki.net>,
linaro-kernel@lists.linaro.org, linux-pm@vger.kernel.org,
skannan@codeaurora.org, peterz@infradead.org,
mturquette@baylibre.com, steve.muckle@linaro.org,
vincent.guittot@linaro.org, morten.rasmussen@arm.com,
dietmar.eggemann@arm.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH V2 0/7] cpufreq: governors: Fix ABBA lockups
Date: Fri, 5 Feb 2016 08:19:26 +0530 [thread overview]
Message-ID: <20160205024926.GD3068@vireshk> (raw)
In-Reply-To: <56B3B9B0.4010401@linux.vnet.ibm.com>
On 05-02-16, 02:20, Shilpasri G Bhat wrote:
> I could see the previous lockdep warnings on pm/next and on top of patch[4].
> On Patch[5-7] I see the below lockdep trace on running './runme' on a Power8 box.
> [ 710.336130] Chain exists of:
> s_active#91 --> &dbs_data->mutex --> od_dbs_cdata.mutex
>
> [ 710.336376] Possible unsafe locking scenario:
>
> [ 710.336488] CPU0 CPU1
> [ 710.336577] ---- ----
> [ 710.336666] lock(od_dbs_cdata.mutex);
> [ 710.336778] lock(&dbs_data->mutex);
> [ 710.336911] lock(od_dbs_cdata.mutex);
> [ 710.337064] lock(s_active#91);
> [ 710.337176]
This is the same lockdep, just that we have added another mutex
(dbs_data->mutex) to it.
Have you tried if all the lockdeps go away with the 8th patch that I
provided yesterday ?
--
viresh
prev parent reply other threads:[~2016-02-05 2:49 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-03 14:02 [PATCH V2 0/7] cpufreq: governors: Fix ABBA lockups Viresh Kumar
2016-02-03 14:02 ` [PATCH V2 1/7] cpufreq: governor: Treat min_sampling_rate as a governor-specific tunable Viresh Kumar
2016-02-05 2:31 ` Rafael J. Wysocki
2016-02-05 2:47 ` Viresh Kumar
2016-02-03 14:02 ` [PATCH V2 2/7] cpufreq: governor: New sysfs show/store callbacks for governor tunables Viresh Kumar
2016-02-03 16:17 ` Viresh Kumar
2016-02-03 14:02 ` [PATCH V2 3/7] cpufreq: governor: Drop unused macros for creating governor tunable attributes Viresh Kumar
2016-02-03 14:02 ` [PATCH V2 4/7] Revert "cpufreq: Drop rwsem lock around CPUFREQ_GOV_POLICY_EXIT" Viresh Kumar
2016-02-03 14:02 ` [PATCH V2 5/7] cpufreq: Merge cpufreq_offline_prepare/finish routines Viresh Kumar
2016-02-03 20:21 ` Saravana Kannan
2016-02-04 1:49 ` Viresh Kumar
2016-02-03 14:02 ` [PATCH V2 6/7] cpufreq: Call __cpufreq_governor() with policy->rwsem held Viresh Kumar
2016-02-03 14:02 ` [PATCH V2 7/7] cpufreq: Remove cpufreq_governor_lock Viresh Kumar
2016-02-04 6:43 ` Viresh Kumar
2016-02-03 15:54 ` [PATCH V2 0/7] cpufreq: governors: Fix ABBA lockups Juri Lelli
2016-02-03 16:10 ` Viresh Kumar
2016-02-03 17:20 ` Juri Lelli
2016-02-03 17:20 ` Rafael J. Wysocki
2016-02-03 23:31 ` Shilpa Bhat
2016-02-03 23:50 ` Rafael J. Wysocki
2016-02-04 5:51 ` Viresh Kumar
2016-02-04 11:09 ` Viresh Kumar
2016-02-04 17:43 ` Saravana Kannan
2016-02-04 17:44 ` Saravana Kannan
2016-02-04 18:18 ` Rafael J. Wysocki
2016-02-05 2:44 ` Viresh Kumar
2016-02-05 3:54 ` Rafael J. Wysocki
2016-02-05 9:49 ` Viresh Kumar
2016-02-08 2:20 ` Rafael J. Wysocki
2016-02-06 2:22 ` Saravana Kannan
2016-02-08 2:28 ` Rafael J. Wysocki
2016-02-09 21:02 ` Saravana Kannan
2016-02-04 6:24 ` Viresh Kumar
2016-02-04 12:17 ` Viresh Kumar
2016-02-04 20:50 ` Shilpasri G Bhat
2016-02-05 2:49 ` Viresh Kumar [this message]
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