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| author | Thomas Gleixner <tglx@linutronix.de> | 2012-04-20 13:05:52 (GMT) |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2012-04-26 10:06:11 (GMT) |
| commit | e80e7813cd772cf30597024b371e73df9736de8d (patch) | |
| tree | 8d9fd073b47120099cd34cc585082b7836f36fe2 | |
| parent | 3b0132ce4fff68b30abdfcb74cffc283af711076 (diff) | |
| download | linux-e80e7813cd772cf30597024b371e73df9736de8d.tar.xz | |
s390: Use generic idle thread allocation
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Link: http://lkml.kernel.org/r/20120420124557.652574928@linutronix.de
| -rw-r--r-- | arch/s390/Kconfig | 1 | ||||
| -rw-r--r-- | arch/s390/kernel/smp.c | 33 |
2 files changed, 3 insertions, 31 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index 9015060..15cab3e 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -122,6 +122,7 @@ config S390 select ARCH_INLINE_WRITE_UNLOCK_BH select ARCH_INLINE_WRITE_UNLOCK_IRQ select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE + select GENERIC_SMP_IDLE_THREAD config SCHED_OMIT_FRAME_POINTER def_bool y diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index fc827aa..992b7b9 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -85,7 +85,6 @@ enum { struct pcpu { struct cpu cpu; - struct task_struct *idle; /* idle process for the cpu */ struct _lowcore *lowcore; /* lowcore page(s) for the cpu */ unsigned long async_stack; /* async stack for the cpu */ unsigned long panic_stack; /* panic stack for the cpu */ @@ -721,26 +720,9 @@ static void __cpuinit smp_start_secondary(void *cpuvoid) cpu_idle(); } -struct create_idle { - struct work_struct work; - struct task_struct *idle; - struct completion done; - int cpu; -}; - -static void __cpuinit smp_fork_idle(struct work_struct *work) -{ - struct create_idle *c_idle; - - c_idle = container_of(work, struct create_idle, work); - c_idle->idle = fork_idle(c_idle->cpu); - complete(&c_idle->done); -} - /* Upping and downing of CPUs */ int __cpuinit __cpu_up(unsigned int cpu, struct task_struct *tidle) { - struct create_idle c_idle; struct pcpu *pcpu; int rc; @@ -750,22 +732,12 @@ int __cpuinit __cpu_up(unsigned int cpu, struct task_struct *tidle) if (pcpu_sigp_retry(pcpu, sigp_initial_cpu_reset, 0) != sigp_order_code_accepted) return -EIO; - if (!pcpu->idle) { - c_idle.done = COMPLETION_INITIALIZER_ONSTACK(c_idle.done); - INIT_WORK_ONSTACK(&c_idle.work, smp_fork_idle); - c_idle.cpu = cpu; - schedule_work(&c_idle.work); - wait_for_completion(&c_idle.done); - if (IS_ERR(c_idle.idle)) - return PTR_ERR(c_idle.idle); - pcpu->idle = c_idle.idle; - } - init_idle(pcpu->idle, cpu); + rc = pcpu_alloc_lowcore(pcpu, cpu); if (rc) return rc; pcpu_prepare_secondary(pcpu, cpu); - pcpu_attach_task(pcpu, pcpu->idle); + pcpu_attach_task(pcpu, tidle); pcpu_start_fn(pcpu, smp_start_secondary, NULL); while (!cpu_online(cpu)) cpu_relax(); @@ -852,7 +824,6 @@ void __init smp_prepare_boot_cpu(void) struct pcpu *pcpu = pcpu_devices; boot_cpu_address = stap(); - pcpu->idle = current; pcpu->state = CPU_STATE_CONFIGURED; pcpu->address = boot_cpu_address; pcpu->lowcore = (struct _lowcore *)(unsigned long) store_prefix(); |