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linux-sg2042
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arm: 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: Russell King <linux@arm.linux.org.uk>
Tested-by: Frank Rowand <frank.rowand@am.sony.com>
Link: http://lkml.kernel.org/r/20120420124557.448826362@linutronix.de
This commit is contained in:
Thomas Gleixner 2012-04-20 13:05:50 +00:00
parent 13583bf15e
commit 84ec6d5796
3 changed files with 2 additions and 26 deletions
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1
arch/arm/Kconfig
View File

@ -34,6 +34,7 @@ config ARM
select CPU_PM if (SUSPEND || CPU_IDLE)
select GENERIC_PCI_IOMAP
select HAVE_BPF_JIT if NET
select GENERIC_SMP_IDLE_THREAD
help
The ARM series is a line of low-power-consumption RISC chip designs
licensed by ARM Ltd and targeted at embedded applications and

1
arch/arm/include/asm/cpu.h
View File

@ -16,7 +16,6 @@
struct cpuinfo_arm {
struct cpu cpu;
#ifdef CONFIG_SMP
struct task_struct *idle;
unsigned int loops_per_jiffy;
#endif
};

26
arch/arm/kernel/smp.c
View File

@ -60,31 +60,10 @@ enum ipi_msg_type {
static DECLARE_COMPLETION(cpu_running);
int __cpuinit __cpu_up(unsigned int cpu, struct task_struct *tidle)
int __cpuinit __cpu_up(unsigned int cpu, struct task_struct *idle)
{
struct cpuinfo_arm *ci = &per_cpu(cpu_data, cpu);
struct task_struct *idle = ci->idle;
int ret;
/*
* Spawn a new process manually, if not already done.
* Grab a pointer to its task struct so we can mess with it
*/
if (!idle) {
idle = fork_idle(cpu);
if (IS_ERR(idle)) {
printk(KERN_ERR "CPU%u: fork() failed\n", cpu);
return PTR_ERR(idle);
}
ci->idle = idle;
} else {
/*
* Since this idle thread is being re-used, call
* init_idle() to reinitialize the thread structure.
*/
init_idle(idle, cpu);
}
/*
* We need to tell the secondary core where to find
* its stack and the page tables.
@ -318,9 +297,6 @@ void __init smp_cpus_done(unsigned int max_cpus)
void __init smp_prepare_boot_cpu(void)
{
unsigned int cpu = smp_processor_id();
per_cpu(cpu_data, cpu).idle = current;
}
void __init smp_prepare_cpus(unsigned int max_cpus)