Commit 8db2bc45 authored by Paul Mundt's avatar Paul Mundt
Browse files

sh: cache secondary CPUs idle loop. 



This provides a cache of the secondary CPUs idle loop for the cases where
hotplug simply enters a low power state instead of resetting or powering
off the core.

Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent 1cfa1e8f

arch/sh/include/asm/processor.h

+4 −0
Original line number Diff line number Diff line
@@ -85,6 +85,10 @@ struct sh_cpuinfo { 
	struct tlb_info itlb;

	struct tlb_info dtlb;



#ifdef CONFIG_SMP

	struct task_struct *idle;

#endif



	unsigned long flags;

} __attribute__ ((aligned(L1_CACHE_BYTES)));

arch/sh/kernel/smp.c

+9 −4
Original line number Diff line number Diff line
@@ -125,12 +125,17 @@ int __cpuinit __cpu_up(unsigned int cpu) 
	struct task_struct *tsk;

	unsigned long timeout;



	tsk = cpu_data[cpu].idle;

	if (!tsk) {

		tsk = fork_idle(cpu);

		if (IS_ERR(tsk)) {

		printk(KERN_ERR "Failed forking idle task for cpu %d\n", cpu);

			pr_err("Failed forking idle task for cpu %d\n", cpu);

			return PTR_ERR(tsk);

		}



		cpu_data[cpu].idle = tsk;

	}



	per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;



	/* Fill in data in head.S for secondary cpus */