[RFC PATCH v6 16/25] sched/rt: Remove support for cgroups-v1

[Yuri Andriaccio <yurand2000@gmail.com>]

Disable control files for cgroups-v1.

Remove cpu_rt_group_init function and functions related to the
cgroup-v1 control files 'rt_runtime_us' and 'rt_period_us'.

Signed-off-by: Yuri Andriaccio <yurand2000@gmail.com>
---
 kernel/sched/core.c  | 50 --------------------------------------------
 kernel/sched/rt.c    | 49 +------------------------------------------
 kernel/sched/sched.h |  4 ----
 3 files changed, 1 insertion(+), 102 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 1252f45feda0..a8a81c69b3d3 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -10150,32 +10150,6 @@ static int cpu_burst_write_u64(struct cgroup_subsys_state *css,
 }
 #endif /* CONFIG_GROUP_SCHED_BANDWIDTH */
 
-#ifdef CONFIG_RT_GROUP_SCHED
-static int cpu_rt_runtime_write(struct cgroup_subsys_state *css,
-				struct cftype *cft, s64 val)
-{
-	return sched_group_set_rt_runtime(css_tg(css), val);
-}
-
-static s64 cpu_rt_runtime_read(struct cgroup_subsys_state *css,
-			       struct cftype *cft)
-{
-	return sched_group_rt_runtime(css_tg(css));
-}
-
-static int cpu_rt_period_write_uint(struct cgroup_subsys_state *css,
-				    struct cftype *cftype, u64 rt_period_us)
-{
-	return sched_group_set_rt_period(css_tg(css), rt_period_us);
-}
-
-static u64 cpu_rt_period_read_uint(struct cgroup_subsys_state *css,
-				   struct cftype *cft)
-{
-	return sched_group_rt_period(css_tg(css));
-}
-#endif /* CONFIG_RT_GROUP_SCHED */
-
 #ifdef CONFIG_GROUP_SCHED_WEIGHT
 static s64 cpu_idle_read_s64(struct cgroup_subsys_state *css,
 			       struct cftype *cft)
@@ -10253,20 +10227,6 @@ static struct cftype cpu_legacy_files[] = {
 };
 
 #ifdef CONFIG_RT_GROUP_SCHED
-static struct cftype rt_group_files[] = {
-	{
-		.name = "rt_runtime_us",
-		.read_s64 = cpu_rt_runtime_read,
-		.write_s64 = cpu_rt_runtime_write,
-	},
-	{
-		.name = "rt_period_us",
-		.read_u64 = cpu_rt_period_read_uint,
-		.write_u64 = cpu_rt_period_write_uint,
-	},
-	{ }	/* Terminate */
-};
-
 # ifdef CONFIG_RT_GROUP_SCHED_DEFAULT_DISABLED
 DEFINE_STATIC_KEY_FALSE(rt_group_sched);
 # else
@@ -10289,16 +10249,6 @@ static int __init setup_rt_group_sched(char *str)
 	return 1;
 }
 __setup("rt_group_sched=", setup_rt_group_sched);
-
-static int __init cpu_rt_group_init(void)
-{
-	if (!rt_group_sched_enabled())
-		return 0;
-
-	WARN_ON(cgroup_add_legacy_cftypes(&cpu_cgrp_subsys, rt_group_files));
-	return 0;
-}
-subsys_initcall(cpu_rt_group_init);
 #endif /* CONFIG_RT_GROUP_SCHED */
 
 static int cpu_extra_stat_show(struct seq_file *sf,
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index 168a92945b4a..4f1e7af2e88d 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -1,3 +1,4 @@
+#pragma GCC diagnostic ignored "-Wunused-function"
 // SPDX-License-Identifier: GPL-2.0
 /*
  * Real-Time Scheduling Class (mapped to the SCHED_FIFO and SCHED_RR
@@ -2258,54 +2259,6 @@ static int tg_set_rt_bandwidth(struct task_group *tg,
 	return err;
 }
 
-int sched_group_set_rt_runtime(struct task_group *tg, long rt_runtime_us)
-{
-	u64 rt_runtime, rt_period;
-
-	rt_period = ktime_to_ns(tg->rt_bandwidth.rt_period);
-	rt_runtime = (u64)rt_runtime_us * NSEC_PER_USEC;
-	if (rt_runtime_us < 0)
-		rt_runtime = RUNTIME_INF;
-	else if ((u64)rt_runtime_us > U64_MAX / NSEC_PER_USEC)
-		return -EINVAL;
-
-	return tg_set_rt_bandwidth(tg, rt_period, rt_runtime);
-}
-
-long sched_group_rt_runtime(struct task_group *tg)
-{
-	u64 rt_runtime_us;
-
-	if (tg->rt_bandwidth.rt_runtime == RUNTIME_INF)
-		return -1;
-
-	rt_runtime_us = tg->rt_bandwidth.rt_runtime;
-	do_div(rt_runtime_us, NSEC_PER_USEC);
-	return rt_runtime_us;
-}
-
-int sched_group_set_rt_period(struct task_group *tg, u64 rt_period_us)
-{
-	u64 rt_runtime, rt_period;
-
-	if (rt_period_us > U64_MAX / NSEC_PER_USEC)
-		return -EINVAL;
-
-	rt_period = rt_period_us * NSEC_PER_USEC;
-	rt_runtime = tg->rt_bandwidth.rt_runtime;
-
-	return tg_set_rt_bandwidth(tg, rt_period, rt_runtime);
-}
-
-long sched_group_rt_period(struct task_group *tg)
-{
-	u64 rt_period_us;
-
-	rt_period_us = ktime_to_ns(tg->rt_bandwidth.rt_period);
-	do_div(rt_period_us, NSEC_PER_USEC);
-	return rt_period_us;
-}
-
 int sched_rt_can_attach(struct task_group *tg)
 {
 	/* Don't accept real-time tasks when there is no way for them to run */
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index bde49f216081..efe52e162ba5 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -607,10 +607,6 @@ extern void start_cfs_bandwidth(struct cfs_bandwidth *cfs_b);
 extern void unthrottle_cfs_rq(struct cfs_rq *cfs_rq);
 extern bool cfs_task_bw_constrained(struct task_struct *p);
 
-extern int sched_group_set_rt_runtime(struct task_group *tg, long rt_runtime_us);
-extern int sched_group_set_rt_period(struct task_group *tg, u64 rt_period_us);
-extern long sched_group_rt_runtime(struct task_group *tg);
-extern long sched_group_rt_period(struct task_group *tg);
 extern int sched_rt_can_attach(struct task_group *tg);
 
 extern struct task_group *sched_create_group(struct task_group *parent);
-- 
2.54.0