[tip:smp/hotplug] cris: Use generic idle loop

tip-bot for Thomas Gleixner
2013-04-08T20:24:39Z

Commit-ID: 8dc7c5ecd8d0f739728d844ee794c4fae169f9c2
Gitweb: http://git.kernel.org/tip/8dc7c5ecd8d0f739728d844ee794c4fae169f9c2
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Thu, 21 Mar 2013 22:49:43 +0100
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitDate: Mon, 8 Apr 2013 17:39:25 +0200

cris: Use generic idle loop

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: Jesper Nilsson <jesper.nilsson@axis.com>
Link: http://lkml.kernel.org/r/20130321215234.148829489@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

---
arch/cris/Kconfig | 1 +
arch/cris/arch-v10/kernel/process.c | 3 ++-
arch/cris/arch-v32/kernel/process.c | 10 +++-------
arch/cris/arch-v32/kernel/smp.c | 4 +---
arch/cris/kernel/process.c | 24 ++----------------------
5 files changed, 9 insertions(+), 33 deletions(-)

diff --git a/arch/cris/Kconfig b/arch/cris/Kconfig
index 06dd026..1dd3635 100644
--- a/arch/cris/Kconfig
+++ b/arch/cris/Kconfig
@@ -48,6 +48,7 @@ config CRIS
select GENERIC_IRQ_SHOW
select GENERIC_IOMAP
select GENERIC_SMP_IDLE_THREAD if ETRAX_ARCH_V32
+ select GENERIC_IDLE_LOOP
select GENERIC_CMOS_UPDATE
select MODULES_USE_ELF_RELA
select CLONE_BACKWARDS2
diff --git a/arch/cris/arch-v10/kernel/process.c b/arch/cris/arch-v10/kernel/process.c
index b101875..2ba23c1 100644
--- a/arch/cris/arch-v10/kernel/process.c
+++ b/arch/cris/arch-v10/kernel/process.c
@@ -30,8 +30,9 @@ void etrax_gpio_wake_up_check(void); /* drivers/gpio.c */
void default_idle(void)
{
#ifdef CONFIG_ETRAX_GPIO
- etrax_gpio_wake_up_check();
+ etrax_gpio_wake_up_check();
#endif
+ local_irq_enable();
}

/*
diff --git a/arch/cris/arch-v32/kernel/process.c b/arch/cris/arch-v32/kernel/process.c
index 4857933..57451fa 100644
--- a/arch/cris/arch-v32/kernel/process.c
+++ b/arch/cris/arch-v32/kernel/process.c
@@ -23,13 +23,9 @@ extern void stop_watchdog(void);
/* We use this if we don't have any better idle routine. */
void default_idle(void)
{
- local_irq_disable();
- if (!need_resched()) {
- /* Halt until exception. */
- __asm__ volatile("ei \n\t"
- "halt ");
- }
- local_irq_enable();
+ /* Halt until exception. */
+ __asm__ volatile("ei \n\t"
+ "halt ");
}

/*
diff --git a/arch/cris/arch-v32/kernel/smp.c b/arch/cris/arch-v32/kernel/smp.c
index 04a16ed..cdd1202 100644
--- a/arch/cris/arch-v32/kernel/smp.c
+++ b/arch/cris/arch-v32/kernel/smp.c
@@ -145,8 +145,6 @@ smp_boot_one_cpu(int cpuid, struct task_struct idle)
* specific stuff such as the local timer and the MMU. */
void __init smp_callin(void)
{
- extern void cpu_idle(void);
-
int cpu = cpu_now_booting;
reg_intr_vect_rw_mask vect_mask = {0};

@@ -170,7 +168,7 @@ void __init smp_callin(void)
local_irq_enable();

set_cpu_online(cpu, true);
- cpu_idle();
+ cpu_startup_entry(CPUHP_ONLINE);
}

/* Stop execution on this CPU.*/
diff --git a/arch/cris/kernel/process.c b/arch/cris/kernel/process.c
index 508c9cd..b78498e 100644
--- a/arch/cris/kernel/process.c
+++ b/arch/cris/kernel/process.c
@@ -34,29 +34,9 @@ extern void default_idle(void);
void (*pm_power_off)(void);
EXPORT_SYMBOL(pm_power_off);

-/*
- * 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 cpu_idle (void)
+void arch_cpu_idle(void)
{
- /* endless idle loop with no priority at all */
- while (1) {
- rcu_idle_enter();
- while (!need_resched()) {
- /*
- * Mark this as an RCU critical section so that
- * synchronize_kernel() in the unload path waits
- * for our completion.
- */
- default_idle();
- }
- rcu_idle_exit();
- schedule_preempt_disabled();
- }
+ default_idle();
}

void hard_reset_now (void);