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: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/include/asm/processor.h b/arch/sh/include/asm/processor.h
index 26b3f02..0a58cb2 100644
--- a/arch/sh/include/asm/processor.h
+++ b/arch/sh/include/asm/processor.h
@@ -85,6 +85,10 @@
struct tlb_info itlb;
struct tlb_info dtlb;
+#ifdef CONFIG_SMP
+ struct task_struct *idle;
+#endif
+
unsigned long flags;
} __attribute__ ((aligned(L1_CACHE_BYTES)));
diff --git a/arch/sh/kernel/smp.c b/arch/sh/kernel/smp.c
index 3711a76..21e7f8a 100644
--- a/arch/sh/kernel/smp.c
+++ b/arch/sh/kernel/smp.c
@@ -125,10 +125,15 @@
struct task_struct *tsk;
unsigned long timeout;
- tsk = fork_idle(cpu);
- if (IS_ERR(tsk)) {
- printk(KERN_ERR "Failed forking idle task for cpu %d\n", cpu);
- return PTR_ERR(tsk);
+ tsk = cpu_data[cpu].idle;
+ if (!tsk) {
+ tsk = fork_idle(cpu);
+ 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;