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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
This commit is contained in:
Thomas Gleixner 2012-04-20 13:05:52 +00:00
parent 3b0132ce4f
commit e80e7813cd
2 changed files with 3 additions and 31 deletions
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1
arch/s390/Kconfig
View File

@ -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

33
arch/s390/kernel/smp.c
View File

@ -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();