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cpuidle: Remove CPUIDLE_FLAG_IGNORE and dev->prepare() 

The cpuidle_device->prepare() mechanism causes updates to the
cpuidle_state[].flags, setting and clearing CPUIDLE_FLAG_IGNORE
to tell the governor not to chose a state on a per-cpu basis at
run-time. State demotion is now handled by the driver and it returns
the actual state entered. Hence, this mechanism is not required.
Also this removes per-cpu flags from cpuidle_state enabling
it to be made global.

Reference:
https://lkml.org/lkml/2011/3/25/52

Signed-off-by: Deepthi Dharwar <deepthi@linux.vnet.ibm>
Signed-off-by: Trinabh Gupta <g.trinabh@gmail.com>
Tested-by: Jean Pihet <j-pihet@ti.com>
Acked-by: Arjan van de Ven <arjan@linux.intel.com>
Reviewed-by: Kevin Hilman <khilman@ti.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Deepthi Dharwar 2011-10-28 16:20:24 +05:30 committed by Len Brown
parent e978aa7d7d
commit b25edc42bf
3 changed files with 0 additions and 15 deletions
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10
drivers/cpuidle/cpuidle.c
View File

@ -83,16 +83,6 @@ int cpuidle_idle_call(void)
hrtimer_peek_ahead_timers();
#endif
/*
* Call the device's prepare function before calling the
* governor's select function. ->prepare gives the device's
* cpuidle driver a chance to update any dynamic information
* of its cpuidle states for the current idle period, e.g.
* state availability, latencies, residencies, etc.
*/
if (dev->prepare)
dev->prepare(dev);
/* ask the governor for the next state */
next_state = cpuidle_curr_governor->select(dev);
if (need_resched()) {

2
drivers/cpuidle/governors/menu.c
View File

@ -288,8 +288,6 @@ static int menu_select(struct cpuidle_device *dev)
for (i = CPUIDLE_DRIVER_STATE_START; i < dev->state_count; i++) {
struct cpuidle_state *s = &dev->states[i];
if (s->flags & CPUIDLE_FLAG_IGNORE)
continue;
if (s->target_residency > data->predicted_us)
continue;
if (s->exit_latency > latency_req)

3
include/linux/cpuidle.h
View File

@ -47,7 +47,6 @@ struct cpuidle_state {
/* Idle State Flags */
#define CPUIDLE_FLAG_TIME_VALID (0x01) /* is residency time measurable? */
#define CPUIDLE_FLAG_IGNORE (0x100) /* ignore during this idle period */
#define CPUIDLE_DRIVER_FLAGS_MASK (0xFFFF0000)
@ -93,8 +92,6 @@ struct cpuidle_device {
struct completion kobj_unregister;
void *governor_data;
int safe_state_index;
int (*prepare) (struct cpuidle_device *dev);
};
DECLARE_PER_CPU(struct cpuidle_device *, cpuidle_devices);