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sh: cache secondary CPUs idle loop.

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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: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2010-04-26 18:59:47 +09:00
parent 1cfa1e8f2c
commit 8db2bc4559
2 changed files with 13 additions and 4 deletions
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4
arch/sh/include/asm/processor.h
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@ -85,6 +85,10 @@ struct sh_cpuinfo {
struct tlb_info itlb; struct tlb_info itlb;
struct tlb_info dtlb; struct tlb_info dtlb;
#ifdef CONFIG_SMP
struct task_struct *idle;
#endif
unsigned long flags; unsigned long flags;
} __attribute__ ((aligned(L1_CACHE_BYTES))); } __attribute__ ((aligned(L1_CACHE_BYTES)));

13
arch/sh/kernel/smp.c
View File

@ -125,10 +125,15 @@ int __cpuinit __cpu_up(unsigned int cpu)
struct task_struct *tsk; struct task_struct *tsk;
unsigned long timeout; unsigned long timeout;
tsk = fork_idle(cpu); tsk = cpu_data[cpu].idle;
if (IS_ERR(tsk)) { if (!tsk) {
printk(KERN_ERR "Failed forking idle task for cpu %d\n", cpu); tsk = fork_idle(cpu);
return PTR_ERR(tsk); if (IS_ERR(tsk)) {
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; per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;