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| author |   Paul Mundt <lethal@linux-sh.org> | 2010-04-26 18:59:47 +0900 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2010-04-26 18:59:47 +0900 |
| commit | 8db2bc4559639680a94d4492ae4b7ce71298a74f (patch) | |
| tree | 568526fbfb22eea6e4a94748425fe1ccfd5f0a29 /arch | |
| parent | sh: flag smp_store_cpu_info() __cpuinit. (diff) | |
| download | linux-dev-8db2bc4559639680a94d4492ae4b7ce71298a74f.tar.xz linux-dev-8db2bc4559639680a94d4492ae4b7ce71298a74f.zip | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/sh/include/asm/processor.h | 4 | ||||
| -rw-r--r-- | arch/sh/kernel/smp.c | 13 |
2 files changed, 13 insertions, 4 deletions
diff --git a/arch/sh/include/asm/processor.h b/arch/sh/include/asm/processor.h index 26b3f026eec9..0a58cb25a658 100644 --- a/arch/sh/include/asm/processor.h +++ b/arch/sh/include/asm/processor.h @@ -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))); diff --git a/arch/sh/kernel/smp.c b/arch/sh/kernel/smp.c index 3711a76a18e0..21e7f8a9f3e4 100644 --- a/arch/sh/kernel/smp.c +++ b/arch/sh/kernel/smp.c @@ -125,10 +125,15 @@ int __cpuinit __cpu_up(unsigned int cpu) 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; |