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Commit ce6eba3d authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'sched-wait-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull wait_var_event updates from Ingo Molnar:
 "This introduces the new wait_var_event() API, which is a more flexible
  waiting primitive than wait_on_atomic_t().

  All wait_on_atomic_t() users are migrated over to the new API and
  wait_on_atomic_t() is removed. The migration fixes one bug and should
  result in no functional changes for the other usecases"

* 'sched-wait-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/wait: Improve __var_waitqueue() code generation
  sched/wait: Remove the wait_on_atomic_t() API
  sched/wait, arch/mips: Fix and convert wait_on_atomic_t() usage to the new wait_var_event() API
  sched/wait, fs/ocfs2: Convert wait_on_atomic_t() usage to the new wait_var_event() API
  sched/wait, fs/nfs: Convert wait_on_atomic_t() usage to the new wait_var_event() API
  sched/wait, fs/fscache: Convert wait_on_atomic_t() usage to the new wait_var_event() API
  sched/wait, fs/btrfs: Convert wait_on_atomic_t() usage to the new wait_var_event() API
  sched/wait, fs/afs: Convert wait_on_atomic_t() usage to the new wait_var_event() API
  sched/wait, drivers/media: Convert wait_on_atomic_t() usage to the new wait_var_event() API
  sched/wait, drivers/drm: Convert wait_on_atomic_t() usage to the new wait_var_event() API
  sched/wait: Introduce wait_var_event()
parents a5532439 b3fc5c9b

arch/mips/kernel/process.c

+2 −0
Original line number Diff line number Diff line
@@ -781,6 +781,8 @@ int mips_set_process_fp_mode(struct task_struct *task, unsigned int value) 
	atomic_set(&task->mm->context.fp_mode_switching, 0);

	preempt_enable();



	wake_up_var(&task->mm->context.fp_mode_switching);



	return 0;

}

arch/mips/kernel/traps.c

+2 −2
Original line number Diff line number Diff line
@@ -1248,8 +1248,8 @@ static int enable_restore_fp_context(int msa) 
	 * If an FP mode switch is currently underway, wait for it to

	 * complete before proceeding.

	 */

	wait_on_atomic_t(&current->mm->context.fp_mode_switching,

			 atomic_t_wait, TASK_KILLABLE);

	wait_var_event(&current->mm->context.fp_mode_switching,

		       !atomic_read(&current->mm->context.fp_mode_switching));



	if (!used_math()) {

		/* First time FP context user. */

drivers/gpu/drm/drm_dp_aux_dev.c

+7 −6
Original line number Diff line number Diff line
@@ -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)

drivers/gpu/drm/i915/selftests/intel_breadcrumbs.c

+4 −10
Original line number Diff line number Diff line
@@ -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));

drivers/media/platform/qcom/venus/hfi.c

+4 −4
Original line number Diff line number Diff line
@@ -106,8 +106,8 @@ int hfi_core_deinit(struct venus_core *core, bool blocking) 


	if (!empty) {

		mutex_unlock(&core->lock);

		wait_on_atomic_t(&core->insts_count, atomic_t_wait,

				 TASK_UNINTERRUPTIBLE);

		wait_var_event(&core->insts_count,

			       !atomic_read(&core->insts_count));

		mutex_lock(&core->lock);

	}
@@ -229,8 +229,8 @@ void hfi_session_destroy(struct venus_inst *inst) 


	mutex_lock(&core->lock);

	list_del_init(&inst->list);

	atomic_dec(&core->insts_count);

	wake_up_atomic_t(&core->insts_count);

	if (atomic_dec_and_test(&core->insts_count))

		wake_up_var(&core->insts_count);

	mutex_unlock(&core->lock);

}

EXPORT_SYMBOL_GPL(hfi_session_destroy);