Commit-ID: d224985a5e312ab05b624143a3fd9bb91b53e52a
Gitweb: https://git.kernel.org/tip/d224985a5e312ab05b624143a3fd9bb91b53e52a
Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
AuthorDate: Thu, 15 Mar 2018 11:41:39 +0100
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Tue, 20 Mar 2018 08:23:18 +0100
sched/wait, drivers/drm: Convert wait_on_atomic_t() usage to the new wait_var_event() API
The old wait_on_atomic_t() is going to get removed, use the more
flexible wait_var_event() API instead.
Unlike wake_up_atomic_t(), wake_up_var() will issue the wakeup
even if the variable is not 0.
No change in functionality.
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxxx>
Cc: David Airlie <airlied@xxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
drivers/gpu/drm/drm_dp_aux_dev.c | 13 +++++++------
drivers/gpu/drm/i915/selftests/intel_breadcrumbs.c | 14 ++++----------
2 files changed, 11 insertions(+), 16 deletions(-)
diff --git a/drivers/gpu/drm/drm_dp_aux_dev.c b/drivers/gpu/drm/drm_dp_aux_dev.c
index 053044201e31..0e4f25d63fd2 100644
--- a/drivers/gpu/drm/drm_dp_aux_dev.c
+++ b/drivers/gpu/drm/drm_dp_aux_dev.c
@@ -177,8 +177,9 @@ static ssize_t auxdev_read_iter(struct kiocb *iocb, struct iov_iter *to)
res = pos - iocb->ki_pos;
iocb->ki_pos = pos;
- atomic_dec(&aux_dev->usecount);
- wake_up_atomic_t(&aux_dev->usecount);
+ if (atomic_dec_and_test(&aux_dev->usecount))
+ wake_up_var(&aux_dev->usecount);
+
return res;
}
@@ -218,8 +219,9 @@ static ssize_t auxdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
res = pos - iocb->ki_pos;
iocb->ki_pos = pos;
- atomic_dec(&aux_dev->usecount);
- wake_up_atomic_t(&aux_dev->usecount);
+ if (atomic_dec_and_test(&aux_dev->usecount))
+ wake_up_var(&aux_dev->usecount);
+
return res;
}
@@ -277,8 +279,7 @@ void drm_dp_aux_unregister_devnode(struct drm_dp_aux *aux)
mutex_unlock(&aux_idr_mutex);
atomic_dec(&aux_dev->usecount);
- wait_on_atomic_t(&aux_dev->usecount, atomic_t_wait,
- TASK_UNINTERRUPTIBLE);
+ wait_var_event(&aux_dev->usecount, !atomic_read(&aux_dev->usecount));
minor = aux_dev->index;
if (aux_dev->dev)
diff --git a/drivers/gpu/drm/i915/selftests/intel_breadcrumbs.c b/drivers/gpu/drm/i915/selftests/intel_breadcrumbs.c
index 54fc571b1102..46580026c7fc 100644
--- a/drivers/gpu/drm/i915/selftests/intel_breadcrumbs.c
+++ b/drivers/gpu/drm/i915/selftests/intel_breadcrumbs.c
@@ -271,18 +271,13 @@ struct igt_wakeup {
u32 seqno;
};
-static int wait_atomic_timeout(atomic_t *p, unsigned int mode)
-{
- return schedule_timeout(10 * HZ) ? 0 : -ETIMEDOUT;
-}
-
static bool wait_for_ready(struct igt_wakeup *w)
{
DEFINE_WAIT(ready);
set_bit(IDLE, &w->flags);
if (atomic_dec_and_test(w->done))
- wake_up_atomic_t(w->done);
+ wake_up_var(w->done);
if (test_bit(STOP, &w->flags))
goto out;
@@ -299,7 +294,7 @@ static bool wait_for_ready(struct igt_wakeup *w)
out:
clear_bit(IDLE, &w->flags);
if (atomic_dec_and_test(w->set))
- wake_up_atomic_t(w->set);
+ wake_up_var(w->set);
return !test_bit(STOP, &w->flags);
}
@@ -342,7 +337,7 @@ static void igt_wake_all_sync(atomic_t *ready,
atomic_set(ready, 0);
wake_up_all(wq);
- wait_on_atomic_t(set, atomic_t_wait, TASK_UNINTERRUPTIBLE);
+ wait_var_event(set, !atomic_read(set));
atomic_set(ready, count);
atomic_set(done, count);
}
@@ -350,7 +345,6 @@ static void igt_wake_all_sync(atomic_t *ready,
static int igt_wakeup(void *arg)
{
I915_RND_STATE(prng);
- const int state = TASK_UNINTERRUPTIBLE;
struct intel_engine_cs *engine = arg;
struct igt_wakeup *waiters;
DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
@@ -418,7 +412,7 @@ static int igt_wakeup(void *arg)
* that they are ready for the next test. We wait until all
* threads are complete and waiting for us (i.e. not a seqno).
*/
- err = wait_on_atomic_t(&done, wait_atomic_timeout, state);
+ err = wait_var_event_timeout(&done, !atomic_read(&done), 10 * HZ);
if (err) {
pr_err("Timed out waiting for %d remaining waiters\n",
atomic_read(&done));
--
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