Disable irq on cpu shutdown flow to ensure interrupts did not bother this cpu after status as offline.
To avoid suspicious RCU usage [0:swapper/0]RCU used illegally from offline CPU! ... [0:swapper/0]lockdep: [name:lockdep&]cpu_id = 0, cpu_is_offline = 1 Signed-off-by: Hanks Chen <hanks.c...@mediatek.com> --- arch/arm/kernel/smp.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index 48099c6e1e4a..6b8f72490320 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -262,6 +262,12 @@ int __cpu_disable(void) remove_cpu_topology(cpu); #endif + /* + * we disable irq here to ensure interrupts + * did not bother this cpu after status as offline. + */ + local_irq_disable(); + /* * Take this CPU offline. Once we clear this, we can't return, * and we must not schedule until we're ready to give up the cpu. @@ -600,11 +606,11 @@ static void ipi_cpu_stop(unsigned int cpu) raw_spin_unlock(&stop_lock); } - set_cpu_online(cpu, false); - local_fiq_disable(); local_irq_disable(); + set_cpu_online(cpu, false); + while (1) { cpu_relax(); wfe(); -- 2.18.0