aboutsummaryrefslogtreecommitdiff
path: root/drivers/cpuidle/cpuidle.c
diff options
context:
space:
mode:
authorLen Brown <len.brown@intel.com>2011-04-01 18:13:10 -0400
committerLen Brown <len.brown@intel.com>2011-08-03 19:06:36 -0400
commit62027aea23fcd14478abdddd3b74a4e0f5fb2984 (patch)
tree1aaa5c1872e296f3448ae6c126175ac9d998e3b4 /drivers/cpuidle/cpuidle.c
parent6dccf9c508d5d773859df1cc2dce75c5b19e35a0 (diff)
downloadlinux-linaro-stable-62027aea23fcd14478abdddd3b74a4e0f5fb2984.tar.gz
cpuidle: create bootparam "cpuidle.off=1"
useful for disabling cpuidle to fall back to architecture-default idle loop cpuidle drivers and governors will fail to register. on x86 they'll say so: intel_idle: intel_idle yielding to (null) ACPI: acpi_idle yielding to (null) Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/cpuidle/cpuidle.c')
-rw-r--r--drivers/cpuidle/cpuidle.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index bf5092455a8f..faae2c357bab 100644
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -28,6 +28,12 @@ LIST_HEAD(cpuidle_detected_devices);
static void (*pm_idle_old)(void);
static int enabled_devices;
+static int off __read_mostly;
+
+int cpuidle_disabled(void)
+{
+ return off;
+}
#if defined(CONFIG_ARCH_HAS_CPU_IDLE_WAIT)
static void cpuidle_kick_cpus(void)
@@ -427,6 +433,9 @@ static int __init cpuidle_init(void)
{
int ret;
+ if (cpuidle_disabled())
+ return -ENODEV;
+
pm_idle_old = pm_idle;
ret = cpuidle_add_class_sysfs(&cpu_sysdev_class);
@@ -438,4 +447,5 @@ static int __init cpuidle_init(void)
return 0;
}
+module_param(off, int, 0444);
core_initcall(cpuidle_init);