Hi
With an ARM Landing Team branch based on LSK 3.18 Android I'm seeing a hang if I
echo 0 > /sys/devices/system/cpu/cpu1/online
After bisecting, I fixed this problem by reverting commit 553b785b5383 ("cpufreq: Iterate over all the possible cpus to create powerstats.")
I was tempted to also revert the other scheduler and cpufreq mods from Google that are part of the same series, just as a precaution, because they don't fill me with confidence, but have left them in for now.