diff options
author | Colin Cross <ccross@android.com> | 2012-03-14 11:29:53 -0700 |
---|---|---|
committer | Viresh Kumar <viresh.kumar@linaro.org> | 2012-07-25 10:02:49 +0100 |
commit | 4f51412c71edab8b3033ea97f84bc0b94470287b (patch) | |
tree | bc1b0122ad063ea0155b31af02ecbbdc853ae3b6 /Documentation/workqueue.txt | |
parent | d678be3dbea5a310f57ead82d076b301b40dc315 (diff) |
cpuidle: coupled: add parallel barrier function
Adds cpuidle_coupled_parallel_barrier, which can be used by coupled
cpuidle state enter functions to handle resynchronization after
determining if any cpu needs to abort. The normal use case will
be:
static bool abort_flag;
static atomic_t abort_barrier;
int arch_cpuidle_enter(struct cpuidle_device *dev, ...)
{
if (arch_turn_off_irq_controller()) {
/* returns an error if an irq is pending and would be lost
if idle continued and turned off power */
abort_flag = true;
}
cpuidle_coupled_parallel_barrier(dev, &abort_barrier);
if (abort_flag) {
/* One of the cpus didn't turn off it's irq controller */
arch_turn_on_irq_controller();
return -EINTR;
}
/* continue with idle */
...
}
This will cause all cpus to abort idle together if one of them needs
to abort.
Reviewed-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Tested-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Reviewed-by: Kevin Hilman <khilman@ti.com>
Tested-by: Kevin Hilman <khilman@ti.com>
Signed-off-by: Colin Cross <ccross@android.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Diffstat (limited to 'Documentation/workqueue.txt')
0 files changed, 0 insertions, 0 deletions