https://bugzilla.kernel.org/show_bug.cgi?id=77201 --- Comment #58 from Mauro <registosites@xxxxxxxxxxx> --- > > 6f1e4efd882 (cpufreq: Fix timer/workqueue corruption by protecting reading > > governor_enabled) > > 87ae97f10c0 (cpufreq: s3c24xx: Staticize local variable) > > result: both ok > > So you tested your stuff on these two commits (i.e. no reverts hacks)? Yes, I have tested with no revert hacks, and as suggested I have tested the commit preceding the suspect commit and the suspect commit. > Okay, lets simplify things a bit.. I have updated my branch again with all > changes you need.. Don't add any other change and just test it. > > I have added this at many locations: > > + pr_info("%s: %d\n", __func__, __LINE__); > > Will print function name and line number in file. > > You *will* get lots of prints now for every frequency transition.. To > control these, enable only *userspace* governor from menuconfig and leave > all other governors disabled. That way there wouldn't be any transition > happening.. > > Now, repeat your earlier test with userspace governor and see which > line/routine is the last one... > > You will come to know broadly about where you have reached.. Now to go to > the exact statement, remove all prints I have added in powernow-k8 and add > them only in your hotpath, and add more of them to the last set of functions > executed. > > Lets see if we can get to the last instruction which crashed :) > > Probably it will be the one changing freq/voltage.. Not much luck with this approach I'm afraid. I have compiled your updated branch with no reverts and changed the config to include only the userspace governor. Then proceeded to test as before: cat /proc/kmsg & echo 800000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed echo 0 > /sys/devices/system/cpu/cpu1/online echo 1 > /sys/devices/system/cpu/cpu1/online echo 1800000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed echo 2200000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed When trying to change the frequency to 2.2GHz the machine becomes unresponsive and there is no output :( I have noticed something that may or may not be important, it doesn't matter if I do 800M - cpu offline/online - 1.8G - 2.2G or 800M - cpu offline/online - 2.2G - 1.8G The machine always becomes unresponsive when trying to do the second frequency change after cpu offline/online. I have pictures of the process, I can attach them if you think they are important, but like I said when the machine hangs there is zero output :( -- You are receiving this mail because: You are the assignee for the bug. -- To unsubscribe from this list: send the line "unsubscribe cpufreq" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
