arm: Use generic idle loop
Use the generic idle loop and replace enable/disable_hlt with the
respective core functions.
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: Russell King <linux@arm.linux.org.uk>
Tested-by: Kevin Hilman <khilman@linaro.org> # OMAP
Link: http://lkml.kernel.org/r/20130321215233.826238797@linutronix.de
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index 92884c8..c9a5e2c 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -57,34 +57,6 @@
"ARM" , "Thumb" , "Jazelle", "ThumbEE"
};
-static volatile int hlt_counter;
-
-void disable_hlt(void)
-{
- hlt_counter++;
-}
-
-void enable_hlt(void)
-{
- hlt_counter--;
- BUG_ON(hlt_counter < 0);
-}
-
-static int __init nohlt_setup(char *__unused)
-{
- hlt_counter = 1;
- return 1;
-}
-
-static int __init hlt_setup(char *__unused)
-{
- hlt_counter = 0;
- return 1;
-}
-
-__setup("nohlt", nohlt_setup);
-__setup("hlt", hlt_setup);
-
extern void call_with_stack(void (*fn)(void *), void *arg, void *sp);
typedef void (*phys_reset_t)(unsigned long);
@@ -168,54 +140,38 @@
local_irq_enable();
}
-/*
- * The idle thread.
- * We always respect 'hlt_counter' to prevent low power idle.
- */
-void cpu_idle(void)
+void arch_cpu_idle_prepare(void)
{
local_fiq_enable();
+}
- /* endless idle loop with no priority at all */
- while (1) {
- tick_nohz_idle_enter();
- rcu_idle_enter();
- ledtrig_cpu(CPU_LED_IDLE_START);
- while (!need_resched()) {
-#ifdef CONFIG_HOTPLUG_CPU
- if (cpu_is_offline(smp_processor_id()))
- cpu_die();
-#endif
-
- /*
- * We need to disable interrupts here
- * to ensure we don't miss a wakeup call.
- */
- local_irq_disable();
+void arch_cpu_idle_enter(void)
+{
+ ledtrig_cpu(CPU_LED_IDLE_START);
#ifdef CONFIG_PL310_ERRATA_769419
- wmb();
+ wmb();
#endif
- if (hlt_counter) {
- local_irq_enable();
- cpu_relax();
- } else if (!need_resched()) {
- stop_critical_timings();
- if (cpuidle_idle_call())
- default_idle();
- start_critical_timings();
- /*
- * default_idle functions must always
- * return with IRQs enabled.
- */
- WARN_ON(irqs_disabled());
- } else
- local_irq_enable();
- }
- ledtrig_cpu(CPU_LED_IDLE_END);
- rcu_idle_exit();
- tick_nohz_idle_exit();
- schedule_preempt_disabled();
- }
+}
+
+void arch_cpu_idle_exit(void)
+{
+ ledtrig_cpu(CPU_LED_IDLE_END);
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+void arch_cpu_idle_dead(void)
+{
+ cpu_die();
+}
+#endif
+
+/*
+ * Called from the core idle loop.
+ */
+void arch_cpu_idle(void)
+{
+ if (cpuidle_idle_call())
+ default_idle();
}
static char reboot_mode = 'h';