diff options
| author | Len Brown <len.brown@intel.com> | 2011-04-02 00:13:10 +0200 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2011-08-04 01:06:36 +0200 |
| commit | 62027aea23fcd14478abdddd3b74a4e0f5fb2984 (patch) | |
| tree | 1aaa5c1872e296f3448ae6c126175ac9d998e3b4 /drivers/cpuidle/driver.c | |
| parent | mrst_pmu: driver for Intel Moorestown Power Management Unit (diff) | |
| download | linux-62027aea23fcd14478abdddd3b74a4e0f5fb2984.tar.xz linux-62027aea23fcd14478abdddd3b74a4e0f5fb2984.zip | |
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/driver.c')
| -rw-r--r-- | drivers/cpuidle/driver.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/cpuidle/driver.c b/drivers/cpuidle/driver.c index fd1601e3d125..3f7e3cedd133 100644 --- a/drivers/cpuidle/driver.c +++ b/drivers/cpuidle/driver.c @@ -26,6 +26,9 @@ int cpuidle_register_driver(struct cpuidle_driver *drv) if (!drv) return -EINVAL; + if (cpuidle_disabled()) + return -ENODEV; + spin_lock(&cpuidle_driver_lock); if (cpuidle_curr_driver) { spin_unlock(&cpuidle_driver_lock); |