[linux-pm] [RFC PATCH V3 4/4] cpuidle: Single/Global registration of idle states
khilman at ti.com
Wed Apr 20 13:33:25 EDT 2011
Trinabh Gupta <trinabh at linux.vnet.ibm.com> writes:
> With this patch there is single copy of cpuidle_states structure
> instead of per-cpu. The statistics needed on per-cpu basis
> by the governor are kept per-cpu. This simplifies the cpuidle
> subsystem as state registration is done by single cpu only.
> Having single copy of cpuidle_states saves memory. Rare case
> of asymmetric C-states can be handled within the cpuidle driverand
> architectures such as POWER do not have asymmetric C-states.
I haven't actually tested this series on OMAP yet, but it currently
The patch below (on top of your series) is required to compile on OMAP,
I think it's doing what you intended, but please confirm.
diff --git a/arch/arm/mach-omap2/cpuidle34xx.c b/arch/arm/mach-omap2/cpuidle34xx.c
index 6641574..ab77ba3 100644
@@ -512,6 +512,7 @@ static int omap3_cpuidle_driver_init(void)
int i, retval, count = 0;
struct omap3_processor_cx *cx;
struct cpuidle_state *state;
+ struct cpuidle_driver *drv = &omap3_idle_driver;
mpu_pd = pwrdm_lookup("mpu_pwrdm");
core_pd = pwrdm_lookup("core_pwrdm");
@@ -532,7 +533,7 @@ static int omap3_cpuidle_driver_init(void)
state->enter = (state->flags & CPUIDLE_FLAG_CHECK_BM) ?
omap3_enter_idle_bm : omap3_enter_idle;
if (cx->type == OMAP3_STATE_C1)
- dev->safe_state_index = count;
+ drv->safe_state_index = count;
sprintf(state->name, "C%d", count+1);
strncpy(state->desc, cx->desc, CPUIDLE_DESC_LEN);
More information about the linux-arm-kernel