On Tue, Jun 12, 2018 at 05:07:37PM +0800, Zhizhou Zhang wrote: > We can't call function trace hook before setup percpu offset. > When entering secondary_start_kernel(), percpu offset has not > been initialized. So this lead hotplug malfunction. > Here is the flow to reproduce this bug: > > echo 0 > /sys/devices/system/cpu/cpu1/online > echo function > /sys/kernel/debug/tracing/current_tracer > echo 1 > /sys/kernel/debug/tracing/tracing_on > echo 1 > /sys/devices/system/cpu/cpu1/online > > Signed-off-by: Zhizhou Zhang <[email protected]>
Queued for 4.18. Thanks. -- Catalin
