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mips: 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>
Cc: Ralf Baechle <ralf@linux-mips.org>
Link: http://lkml.kernel.org/r/20120420124557.512158271@linutronix.de
This commit is contained in:
Thomas Gleixner 2012-04-20 13:05:51 +00:00
parent 84ec6d5796
commit 360014a361
2 changed files with 2 additions and 53 deletions
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1
arch/mips/Kconfig
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@ -29,6 +29,7 @@ config MIPS
select HAVE_MEMBLOCK select HAVE_MEMBLOCK
select HAVE_MEMBLOCK_NODE_MAP select HAVE_MEMBLOCK_NODE_MAP
select ARCH_DISCARD_MEMBLOCK select ARCH_DISCARD_MEMBLOCK
select GENERIC_SMP_IDLE_THREAD
menu "Machine selection" menu "Machine selection"

54
arch/mips/kernel/smp.c
View File

@ -186,61 +186,9 @@ void __devinit smp_prepare_boot_cpu(void)
cpu_set(0, cpu_callin_map); cpu_set(0, cpu_callin_map);
} }
/*
* Called once for each "cpu_possible(cpu)". Needs to spin up the cpu
* and keep control until "cpu_online(cpu)" is set. Note: cpu is
* physical, not logical.
*/
static struct task_struct *cpu_idle_thread[NR_CPUS];
struct create_idle {
struct work_struct work;
struct task_struct *idle;
struct completion done;
int cpu;
};
static void __cpuinit do_fork_idle(struct work_struct *work)
{
struct create_idle *c_idle =
container_of(work, struct create_idle, work);
c_idle->idle = fork_idle(c_idle->cpu);
complete(&c_idle->done);
}
int __cpuinit __cpu_up(unsigned int cpu, struct task_struct *tidle) int __cpuinit __cpu_up(unsigned int cpu, struct task_struct *tidle)
{ {
struct task_struct *idle; mp_ops->boot_secondary(cpu, tidle);
/*
* Processor goes to start_secondary(), sets online flag
* The following code is purely to make sure
* Linux can schedule processes on this slave.
*/
if (!cpu_idle_thread[cpu]) {
/*
* Schedule work item to avoid forking user task
* Ported from arch/x86/kernel/smpboot.c
*/
struct create_idle c_idle = {
.cpu = cpu,
.done = COMPLETION_INITIALIZER_ONSTACK(c_idle.done),
};
INIT_WORK_ONSTACK(&c_idle.work, do_fork_idle);
schedule_work(&c_idle.work);
wait_for_completion(&c_idle.done);
idle = cpu_idle_thread[cpu] = c_idle.idle;
if (IS_ERR(idle))
panic(KERN_ERR "Fork failed for CPU %d", cpu);
} else {
idle = cpu_idle_thread[cpu];
init_idle(idle, cpu);
}
mp_ops->boot_secondary(cpu, idle);
/* /*
* Trust is futile. We should really have timeouts ... * Trust is futile. We should really have timeouts ...