ARM CPU Hotplug breakage on mach-shmobile and KZM9D

[Magnus Damm]

Hi everyone,

Bad news: CPU Hotplug on KZM9D seems broken on recent kernels.

On renesas-next-20130710 or earlier I can perform the following:

# echo 0 > /sys/devices/system/cpu/cpu1/online
CPU1: shutdown
# echo 1 > /sys/devices/system/cpu/cpu1/online
CPU1: Booted secondary processor
#

While on more recent kernels the hotplug boot fails. This may be
related to the move to v3.11-rc. The tag renesas-next-20130710
surprisingly seems to be the final kernel based on v3.10-rc before
jumping to v3.11-rc.

I wonder, do other ARM platforms have working CPU Hotplug in v3.11-rc?

Cheers,

/ magnus