On 04/13/2013 02:55 AM, Sedat Dilek wrote:
On Sat, Apr 13, 2013 at 12:51 AM, Rafael J. Wysocki rjw@sisk.pl wrote:
On Friday, April 12, 2013 11:08:37 PM Sedat Dilek wrote:
On Fri, Apr 12, 2013 at 6:27 PM, Sedat Dilek sedat.dilek@gmail.com wrote:
On Fri, Apr 12, 2013 at 5:45 PM, Sedat Dilek sedat.dilek@gmail.com wrote:
On Fri, Apr 12, 2013 at 4:24 PM, Sedat Dilek sedat.dilek@gmail.com wrote:
On Fri, Apr 12, 2013 at 10:23 AM, Viresh Kumar viresh.kumar@linaro.org wrote: > On 10 April 2013 11:44, Sedat Dilek sedat.dilek@gmail.com wrote: >> I found this "[RFC PATCH] kbuild: Build linux-tools package with 'make >> deb-pkg'" from February 2012. >> Can't say what happened to it... > > Sedat, > > Sorry for being late. I am down with Fever and throat infection since few days. > Still struggling with it.. > > There are few things i tried. Firstly the tag: next-20130326 is bad as there are > some bad commits in cpufreq core in it. > > I then tried latest linux-next/master on my Thinkpad (model name : Intel(R) > Core(TM) i7-2640M CPU @ 2.80GHz) and couldn't boot it up. My ubuntu > just hanged. > > Then i tried Rafael's linux-next branch > > 079576f Merge branch 'pm-cpufreq-next' into linux-next > > And couldn't find any issues with it. I am easily able to remove/add cpus at > runtime.. > > Can you give this branch a try? >
OK, you seem to be well again, nice to hear.
I was doing the whole week spring-cleaning in the apartment of my parents. Now, I have some minutes for a compilation run.
I guess "cpufreq: Call __cpufreq_governor() with correct policy->cpus mask" could be the correct fix, but will try the GIT branch you have mentioned.
- Sedat -
[1] http://git.kernel.org/cgit/linux/kernel/git/rafael/linux-pm.git/commit/?h=li...
Both BROKEN here, specific pm-next commitid and pulling pm.git#linux-next into next-20130411 (see attached files).
Is "cpufreq: convert cpufreq_driver to using RCU" the root cause of this all?
[ CC Nathan ]
NO, wrong assumption.
2013-04-12 18:04 Sedat Dilek o [revert-cpufreq-rcu] Revert "cpufreq: convert cpufreq_driver to using RCU" 2013-04-12 18:04 Sedat Dilek o Revert "cpufreq: Call __cpufreq_governor() with correct policy->cpus mask" 2013-04-11 23:24 Rafael J. Wysocki M─┐ [pm-next-079576f] Merge branch 'pm-cpufreq-next' into linux-next
- Sedat -
- Sedat -
[1] http://git.kernel.org/cgit/linux/kernel/git/rafael/linux-pm.git/commit/?h=li...
> -- > viresh
[ TO Dirk (Author of Intel pstate driver) ]
With CONFIG_X86_INTEL_PSTATE=n (unset) I do not see the call-trace!
My kernel-config and dmesg are attached.
You're seeing a trouble with a new driver, then, so that's not a regression.
This IS a regression.
If the intel_pstate driver is being used __cpufreq_governor() should NOT be called intel_pstate does not implement the target() callback.
Nathan's commit 5800043b2 changed the fence around the call to __cpufreq_governor() in __cpufreq_remove_dev() here is the relevant hunk.
@@ -1007,9 +1068,12 @@ static int __cpufreq_remove_dev(struct device *dev, struct subsys_interface *sif unsigned int cpu = dev->id, ret, cpus; unsigned long flags; struct cpufreq_policy *data; + struct cpufreq_driver *driver; struct kobject *kobj; struct completion *cmp; struct device *cpu_dev; + bool has_target; + int (*exit)(struct cpufreq_policy *policy);
pr_debug("%s: unregistering CPU %u\n", __func__, cpu);
@@ -1025,14 +1089,19 @@ static int __cpufreq_remove_dev(struct device *dev, struct subsys_interface *sif return -EINVAL; }
- if (cpufreq_driver->target) + rcu_read_lock(); + driver = rcu_dereference(cpufreq_driver); + has_target = driver->target ? true : false; + exit = driver->exit; + if (has_target) __cpufreq_governor(data, CPUFREQ_GOV_STOP);
#ifdef CONFIG_HOTPLUG_CPU - if (!cpufreq_driver->setpolicy) + if (!driver->setpolicy) strncpy(per_cpu(cpufreq_cpu_governor, cpu), data->governor->name, CPUFREQ_NAME_LEN); #endif + rcu_read_unlock();
WARN_ON(lock_policy_rwsem_write(cpu)); cpus = cpumask_weight(data->cpus);
What do you mean by this?
What are the next steps to get this fixed?
- Sedat -
Thanks for taking the time to debug this!
Rafael
-- I speak only for myself. Rafael J. Wysocki, Intel Open Source Technology Center.