The following commit has been merged into the sched/fifo branch of tip:
Commit-ID: 8b700983de82f79e05b2c1136d6513ea4c9b22c4
Gitweb: https://git.kernel.org/tip/8b700983de82f79e05b2c1136d6513ea4c9b22c4
Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
AuthorDate: Wed, 22 Apr 2020 13:10:04 +02:00
Committer: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Mon, 15 Jun 2020 14:10:26 +02:00
sched: Remove sched_set_*() return value
Ingo suggested that since the new sched_set_*() functions are
implemented using the 'nocheck' variants, they really shouldn't ever
fail, so remove the return value.
Cc: axboe@xxxxxxxxx
Cc: daniel.lezcano@xxxxxxxxxx
Cc: sudeep.holla@xxxxxxx
Cc: airlied@xxxxxxxxxx
Cc: broonie@xxxxxxxxxx
Cc: paulmck@xxxxxxxxxx
Suggested-by: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Reviewed-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
drivers/block/drbd/drbd_receiver.c | 4 +---
drivers/firmware/psci/psci_checker.c | 3 +--
drivers/gpu/drm/msm/msm_drv.c | 5 +----
drivers/platform/chrome/cros_ec_spi.c | 7 +++----
include/linux/sched.h | 6 +++---
kernel/rcu/rcutorture.c | 5 +----
kernel/sched/core.c | 12 ++++++------
7 files changed, 16 insertions(+), 26 deletions(-)
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index 140fd98..280615e 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -6020,9 +6020,7 @@ int drbd_ack_receiver(struct drbd_thread *thi)
int expect = header_size;
bool ping_timeout_active = false;
- rv = sched_set_fifo_low(current);
- if (rv < 0)
- drbd_err(connection, "drbd_ack_receiver: ERROR set priority, ret=%d\n", rv);
+ sched_set_fifo_low(current);
while (get_t_state(thi) == RUNNING) {
drbd_thread_current_set_cpu(thi);
diff --git a/drivers/firmware/psci/psci_checker.c b/drivers/firmware/psci/psci_checker.c
index a5279a4..6fff482 100644
--- a/drivers/firmware/psci/psci_checker.c
+++ b/drivers/firmware/psci/psci_checker.c
@@ -281,8 +281,7 @@ static int suspend_test_thread(void *arg)
wait_for_completion(&suspend_threads_started);
/* Set maximum priority to preempt all other threads on this CPU. */
- if (sched_set_fifo(current))
- pr_warn("Failed to set suspend thread scheduler on CPU %d\n", cpu);
+ sched_set_fifo(current);
dev = this_cpu_read(cpuidle_devices);
drv = cpuidle_get_cpu_driver(dev);
diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 89a8b9c..556cca3 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -509,10 +509,7 @@ static int msm_drm_init(struct device *dev, struct drm_driver *drv)
goto err_msm_uninit;
}
- ret = sched_set_fifo(priv->event_thread[i].thread);
- if (ret)
- dev_warn(dev, "event_thread set priority failed:%d\n",
- ret);
+ sched_set_fifo(priv->event_thread[i].thread);
}
ret = drm_vblank_init(ddev, priv->num_crtcs);
diff --git a/drivers/platform/chrome/cros_ec_spi.c b/drivers/platform/chrome/cros_ec_spi.c
index c20a43a..d092603 100644
--- a/drivers/platform/chrome/cros_ec_spi.c
+++ b/drivers/platform/chrome/cros_ec_spi.c
@@ -725,10 +725,9 @@ static int cros_ec_spi_devm_high_pri_alloc(struct device *dev,
if (err)
return err;
- err = sched_set_fifo(ec_spi->high_pri_worker->task);
- if (err)
- dev_err(dev, "Can't set cros_ec high pri priority: %d\n", err);
- return err;
+ sched_set_fifo(ec_spi->high_pri_worker->task);
+
+ return 0;
}
static int cros_ec_spi_probe(struct spi_device *spi)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index b792b8f..ae76644 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1653,9 +1653,9 @@ extern int idle_cpu(int cpu);
extern int available_idle_cpu(int cpu);
extern int sched_setscheduler(struct task_struct *, int, const struct sched_param *);
extern int sched_setscheduler_nocheck(struct task_struct *, int, const struct sched_param *);
-extern int sched_set_fifo(struct task_struct *p);
-extern int sched_set_fifo_low(struct task_struct *p);
-extern int sched_set_normal(struct task_struct *p, int nice);
+extern void sched_set_fifo(struct task_struct *p);
+extern void sched_set_fifo_low(struct task_struct *p);
+extern void sched_set_normal(struct task_struct *p, int nice);
extern int sched_setattr(struct task_struct *, const struct sched_attr *);
extern int sched_setattr_nocheck(struct task_struct *, const struct sched_attr *);
extern struct task_struct *idle_task(int cpu);
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index bbc3c8a..b4c1146 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -893,10 +893,7 @@ static int rcu_torture_boost(void *arg)
VERBOSE_TOROUT_STRING("rcu_torture_boost started");
/* Set real-time priority. */
- if (sched_set_fifo_low(current) < 0) {
- VERBOSE_TOROUT_STRING("rcu_torture_boost RT prio failed!");
- n_rcu_torture_boost_rterror++;
- }
+ sched_set_fifo_low(current);
init_rcu_head_on_stack(&rbi.rcu);
/* Each pass through the following loop does one boost-test cycle. */
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index f882d3d..41d3778 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5183,30 +5183,30 @@ int sched_setscheduler_nocheck(struct task_struct *p, int policy,
* The administrator _MUST_ configure the system, the kernel simply doesn't
* know enough information to make a sensible choice.
*/
-int sched_set_fifo(struct task_struct *p)
+void sched_set_fifo(struct task_struct *p)
{
struct sched_param sp = { .sched_priority = MAX_RT_PRIO / 2 };
- return sched_setscheduler_nocheck(p, SCHED_FIFO, &sp);
+ WARN_ON_ONCE(sched_setscheduler_nocheck(p, SCHED_FIFO, &sp) != 0);
}
EXPORT_SYMBOL_GPL(sched_set_fifo);
/*
* For when you don't much care about FIFO, but want to be above SCHED_NORMAL.
*/
-int sched_set_fifo_low(struct task_struct *p)
+void sched_set_fifo_low(struct task_struct *p)
{
struct sched_param sp = { .sched_priority = 1 };
- return sched_setscheduler_nocheck(p, SCHED_FIFO, &sp);
+ WARN_ON_ONCE(sched_setscheduler_nocheck(p, SCHED_FIFO, &sp) != 0);
}
EXPORT_SYMBOL_GPL(sched_set_fifo_low);
-int sched_set_normal(struct task_struct *p, int nice)
+void sched_set_normal(struct task_struct *p, int nice)
{
struct sched_attr attr = {
.sched_policy = SCHED_NORMAL,
.sched_nice = nice,
};
- return sched_setattr_nocheck(p, &attr);
+ WARN_ON_ONCE(sched_setattr_nocheck(p, &attr) != 0);
}
EXPORT_SYMBOL_GPL(sched_set_normal);
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