Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6

* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6: (112 commits)
  ACPI: fix build warning
  Revert "cpuidle: build fix for non-x86"
  ACPI: update intrd DSDT override console messages
  ACPI: update DSDT override documentation
  ACPI: Add "acpi_no_initrd_override" kernel parameter
  ACPI: its a directory not a folder....
  ACPI: misc cleanups
  ACPI: add missing prink prefix strings
  ACPI: cleanup acpi.h
  ACPICA: fix CONFIG_ACPI_DEBUG_FUNC_TRACE build
  ACPI: video: Ignore ACPI video devices that aren't present in hardware
  ACPI: video: reset brightness on resume
  ACPI: video: call ACPI notifier chain for ACPI video notifications
  ACPI: create notifier chain to get hotkey events to graphics driver
  ACPI: video: delete unused display switch on hotkey event code
  ACPI: video: create "brightness_switch_enabled" modparam
  cpuidle: Add a poll_idle method
  ACPI: cpuidle: Support C1 idle time accounting
  ACPI: enable MWAIT for C1 idle
  ACPI: idle: Fix acpi_safe_halt usages and interrupt enabling/disabling
  ...

1 files changed, 41 insertions, 0 deletions

diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index 2a98d99cbd46..2c4b2d47973e 100644
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -15,6 +15,7 @@
 #include <linux/pm_qos_params.h>
 #include <linux/cpu.h>
 #include <linux/cpuidle.h>
+#include <linux/ktime.h>
 
 #include "cpuidle.h"
 
@@ -180,6 +181,44 @@ void cpuidle_disable_device(struct cpuidle_device *dev)
 
 EXPORT_SYMBOL_GPL(cpuidle_disable_device);
 
+#ifdef CONFIG_ARCH_HAS_CPU_RELAX
+static int poll_idle(struct cpuidle_device *dev, struct cpuidle_state *st)
+{
+	ktime_t	t1, t2;
+	s64 diff;
+	int ret;
+
+	t1 = ktime_get();
+	local_irq_enable();
+	while (!need_resched())
+		cpu_relax();
+
+	t2 = ktime_get();
+	diff = ktime_to_us(ktime_sub(t2, t1));
+	if (diff > INT_MAX)
+		diff = INT_MAX;
+
+	ret = (int) diff;
+	return ret;
+}
+
+static void poll_idle_init(struct cpuidle_device *dev)
+{
+	struct cpuidle_state *state = &dev->states[0];
+
+	cpuidle_set_statedata(state, NULL);
+
+	snprintf(state->name, CPUIDLE_NAME_LEN, "C0 (poll idle)");
+	state->exit_latency = 0;
+	state->target_residency = 0;
+	state->power_usage = -1;
+	state->flags = CPUIDLE_FLAG_POLL | CPUIDLE_FLAG_TIME_VALID;
+	state->enter = poll_idle;
+}
+#else
+static void poll_idle_init(struct cpuidle_device *dev) {}
+#endif /* CONFIG_ARCH_HAS_CPU_RELAX */
+
 /**
  * cpuidle_register_device - registers a CPU's idle PM feature
  * @dev: the cpu
@@ -198,6 +237,8 @@ int cpuidle_register_device(struct cpuidle_device *dev)
 
 	mutex_lock(&cpuidle_lock);
 
+	poll_idle_init(dev);
+
 	per_cpu(cpuidle_devices, dev->cpu) = dev;
 	list_add(&dev->device_list, &cpuidle_detected_devices);
 	if ((ret = cpuidle_add_sysfs(sys_dev))) {