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authorThomas Gleixner <tglx@linutronix.de>2013-03-21 22:49:38 +0100
committerThomas Gleixner <tglx@linutronix.de>2013-04-08 17:39:24 +0200
commitf7b861b7a6d9d1838cbbb5f4053e61578b86d134 (patch)
tree07a20a48c6577f92ad702e93ccb308a6d12632db /arch/arm/kernel
parenta123322d8afcfb5f86e0cc0062024084658aeeb2 (diff)
downloadvexpress-lsk-f7b861b7a6d9d1838cbbb5f4053e61578b86d134.tar.gz
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
Diffstat (limited to 'arch/arm/kernel')
-rw-r--r--arch/arm/kernel/process.c96
-rw-r--r--arch/arm/kernel/smp.c2
2 files changed, 27 insertions, 71 deletions
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index 92884c86189..c9a5e2ce8aa 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -57,34 +57,6 @@ static const char *isa_modes[] = {
"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 @@ static void default_idle(void)
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();
+void arch_cpu_idle_enter(void)
+{
+ ledtrig_cpu(CPU_LED_IDLE_START);
+#ifdef CONFIG_PL310_ERRATA_769419
+ wmb();
#endif
+}
- /*
- * We need to disable interrupts here
- * to ensure we don't miss a wakeup call.
- */
- local_irq_disable();
-#ifdef CONFIG_PL310_ERRATA_769419
- wmb();
+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
- 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();
- }
+
+/*
+ * Called from the core idle loop.
+ */
+void arch_cpu_idle(void)
+{
+ if (cpuidle_idle_call())
+ default_idle();
}
static char reboot_mode = 'h';
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 1f2ccccaf00..4619177bcfe 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -336,7 +336,7 @@ asmlinkage void __cpuinit secondary_start_kernel(void)
/*
* OK, it's off to the idle thread for us
*/
- cpu_idle();
+ cpu_startup_entry(CPUHP_ONLINE);
}
void __init smp_cpus_done(unsigned int max_cpus)