Despite recent fixes, userspace-initiated CPU hotplug still can destructively race with the migration code's CPU state manipulations. And parts of the LPM implementation have potentially long-running code, especially on larger systems, that ties up the CPU causing RCU stalls etc.
Changes since v1: - Correct description of cpu hotplug vs LPM race. - Add fix for long-running code in pseries_devicetree_update and friends Nathan Lynch (3): powerpc/rtas: use device model APIs and serialization during LPM powerpc/rtas: allow rescheduling while changing cpu states powerpc/pseries/mobility: use cond_resched when updating device tree arch/powerpc/kernel/rtas.c | 13 ++++++++++--- arch/powerpc/platforms/pseries/mobility.c | 9 +++++++++ 2 files changed, 19 insertions(+), 3 deletions(-) -- 2.20.1
