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arc: Use generic idle loop 

The generic idle loop implements all functionality. Aside of that it
allows arc to implement the tsk_is_polling() functionality correctly,
despite the patently (now gone) comment in the original arc cpu_idle()
function:
/* Since we SLEEP in idle loop, TIF_POLLING_NRFLAG can't be set */
See kernel/cpu/idle.c

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>
Acked-by: Vineet Gupta <vgupta@synopsys.com>
Tested-by: Vineet Gupta <vgupta@synopsys.com>
Link: http://lkml.kernel.org/r/20130321215233.711253792@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
hifive-unleashed-5.1
Thomas Gleixner 2013-03-21 22:49:36 +01:00
parent d166991234
commit fa35e42a00
3 changed files with 3 additions and 27 deletions
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1
arch/arc/Kconfig
View File

@ -14,6 +14,7 @@ config ARC
select GENERIC_ATOMIC64
select GENERIC_CLOCKEVENTS
select GENERIC_FIND_FIRST_BIT
select GENERIC_IDLE_LOOP
# for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP
select GENERIC_IRQ_SHOW
select GENERIC_KERNEL_EXECVE

27
arch/arc/kernel/process.c
View File

@ -41,37 +41,12 @@ SYSCALL_DEFINE0(arc_gettls)
return task_thread_info(current)->thr_ptr;
}
static inline void arch_idle(void)
void arch_cpu_idle(void)
{
/* sleep, but enable all interrupts before committing */
__asm__("sleep 0x3");
}
void cpu_idle(void)
{
/* Since we SLEEP in idle loop, TIF_POLLING_NRFLAG can't be set */
/* endless idle loop with no priority at all */
while (1) {
tick_nohz_idle_enter();
rcu_idle_enter();
doze:
local_irq_disable();
if (!need_resched()) {
arch_idle();
goto doze;
} else {
local_irq_enable();
}
rcu_idle_exit();
tick_nohz_idle_exit();
schedule_preempt_disabled();
}
}
asmlinkage void ret_from_fork(void);
/* Layout of Child kernel mode stack as setup at the end of this function is

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

@ -141,7 +141,7 @@ void __cpuinit start_kernel_secondary(void)
local_irq_enable();
preempt_disable();
cpu_idle();
cpu_startup_entry(CPUHP_ONLINE);
}
/*