Merge branch 'core-fixes-for-linus' of... (c000131c) · Commits · 戴 / test

kernel/rcuclassic.c

+15 −1

Original line number	Diff line number	Diff line
		@@ -89,8 +89,22 @@ static void force_quiescent_state(struct rcu_data *rdp,
		/*
		* Don't send IPI to itself. With irqs disabled,
		* rdp->cpu is the current cpu.
		*
		* cpu_online_map is updated by the _cpu_down()
		* using stop_machine_run(). Since we're in irqs disabled
		* section, stop_machine_run() is not exectuting, hence
		* the cpu_online_map is stable.
		*
		* However, a cpu might have been offlined _just_ before
		* we disabled irqs while entering here.
		* And rcu subsystem might not yet have handled the CPU_DEAD
		* notification, leading to the offlined cpu's bit
		* being set in the rcp->cpumask.
		*
		* Hence cpumask = (rcp->cpumask & cpu_online_map) to prevent
		* sending smp_reschedule() to an offlined CPU.
		*/
		cpumask = rcp->cpumask;
		cpus_and(cpumask, rcp->cpumask, cpu_online_map);
		cpu_clear(rdp->cpu, cpumask);
		for_each_cpu_mask(cpu, cpumask)
		smp_send_reschedule(cpu);