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mips: Use generic idle loop

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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Reviewed-by: Cc: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Cc: Magnus Damm <magnus.damm@gmail.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Link: http://lkml.kernel.org/r/20130321215234.754954871@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2013-03-21 22:49:52 +01:00
parent e962bb9e9c
commit cdbedc61c8
3 changed files with 20 additions and 37 deletions
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1
arch/mips/Kconfig
View File

@ -34,6 +34,7 @@ config MIPS
select HAVE_MEMBLOCK_NODE_MAP select HAVE_MEMBLOCK_NODE_MAP
select ARCH_DISCARD_MEMBLOCK select ARCH_DISCARD_MEMBLOCK
select GENERIC_SMP_IDLE_THREAD select GENERIC_SMP_IDLE_THREAD
select GENERIC_IDLE_LOOP
select BUILDTIME_EXTABLE_SORT select BUILDTIME_EXTABLE_SORT
select GENERIC_CLOCKEVENTS select GENERIC_CLOCKEVENTS
select GENERIC_CMOS_UPDATE select GENERIC_CMOS_UPDATE

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

@ -41,44 +41,26 @@
#include <asm/inst.h> #include <asm/inst.h>
#include <asm/stacktrace.h> #include <asm/stacktrace.h>
/*
* The idle thread. There's no useful work to be done, so just try to conserve
* power and have a low exit latency (ie sit in a loop waiting for somebody to
* say that they'd like to reschedule)
*/
void __noreturn cpu_idle(void)
{
int cpu;
/* CPU is going idle. */
cpu = smp_processor_id();
/* endless idle loop with no priority at all */
while (1) {
tick_nohz_idle_enter();
rcu_idle_enter();
while (!need_resched() && cpu_online(cpu)) {
#ifdef CONFIG_MIPS_MT_SMTC
extern void smtc_idle_loop_hook(void);
smtc_idle_loop_hook();
#endif
if (cpu_wait) {
/* Don't trace irqs off for idle */
stop_critical_timings();
(*cpu_wait)();
start_critical_timings();
}
}
#ifdef CONFIG_HOTPLUG_CPU #ifdef CONFIG_HOTPLUG_CPU
if (!cpu_online(cpu) && !cpu_isset(cpu, cpu_callin_map)) void arch_cpu_idle_dead(void)
play_dead(); {
/* What the heck is this check doing ? */
if (!cpu_isset(smp_processor_id(), cpu_callin_map))
play_dead();
}
#endif #endif
rcu_idle_exit();
tick_nohz_idle_exit(); void arch_cpu_idle(void)
schedule_preempt_disabled(); {
} #ifdef CONFIG_MIPS_MT_SMTC
extern void smtc_idle_loop_hook(void);
smtc_idle_loop_hook();
#endif
if (cpu_wait)
(*cpu_wait)();
else
local_irq_enable();
} }
asmlinkage void ret_from_fork(void); asmlinkage void ret_from_fork(void);

2
arch/mips/kernel/smp.c
View File

@ -139,7 +139,7 @@ asmlinkage __cpuinit void start_secondary(void)
WARN_ON_ONCE(!irqs_disabled()); WARN_ON_ONCE(!irqs_disabled());
mp_ops->smp_finish(); mp_ops->smp_finish();
cpu_idle(); cpu_startup_entry(CPUHP_ONLINE);
} }
/* /*