linux-kernel - [PATCH] sched/rt: case sysctl_sched_rt

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Message-Id: <20231008021538.3063250-1-yajun.deng@linux.dev>
Date:   Sun,  8 Oct 2023 10:15:38 +0800
From:   Yajun Deng <yajun.deng@...ux.dev>
To:     mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        bristot@...hat.com, vschneid@...hat.com
Cc:     linux-kernel@...r.kernel.org, Yajun Deng <yajun.deng@...ux.dev>
Subject: [PATCH] sched/rt: case sysctl_sched_rt_period to integer

proc_dointvec_minmax is for integer, but sysctl_sched_rt_period is an
unsigned integer. And sysctl_sched_rt_period takes values from 1 to
INT_MAX, so sysctl_sched_rt_period doesn't have to be an unsigned integer.

Case sysctl_sched_rt_period to integer. Also, change the maximum value
of sysctl_sched_rt_runtime to sysctl_sched_rt_period.

Signed-off-by: Yajun Deng <yajun.deng@...ux.dev>
---
 kernel/sched/rt.c    | 6 +++---
 kernel/sched/sched.h | 2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index 88fc98601413..76d82a096e03 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -16,7 +16,7 @@ struct rt_bandwidth def_rt_bandwidth;
  * period over which we measure -rt task CPU usage in us.
  * default: 1s
  */
-unsigned int sysctl_sched_rt_period = 1000000;
+int sysctl_sched_rt_period = 1000000;
 
 /*
  * part of the period that we allow rt tasks to run in us.
@@ -34,7 +34,7 @@ static struct ctl_table sched_rt_sysctls[] = {
 	{
 		.procname       = "sched_rt_period_us",
 		.data           = &sysctl_sched_rt_period,
-		.maxlen         = sizeof(unsigned int),
+		.maxlen         = sizeof(int),
 		.mode           = 0644,
 		.proc_handler   = sched_rt_handler,
 		.extra1         = SYSCTL_ONE,
@@ -47,7 +47,7 @@ static struct ctl_table sched_rt_sysctls[] = {
 		.mode           = 0644,
 		.proc_handler   = sched_rt_handler,
 		.extra1         = SYSCTL_NEG_ONE,
-		.extra2         = SYSCTL_INT_MAX,
+		.extra2         = (void *)&sysctl_sched_rt_period,
 	},
 	{
 		.procname       = "sched_rr_timeslice_ms",
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 649eb9ec0657..515eb4cffd5e 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -105,7 +105,7 @@ extern long calc_load_fold_active(struct rq *this_rq, long adjust);
 
 extern void call_trace_sched_update_nr_running(struct rq *rq, int count);
 
-extern unsigned int sysctl_sched_rt_period;
+extern int sysctl_sched_rt_period;
 extern int sysctl_sched_rt_runtime;
 extern int sched_rr_timeslice;
 
-- 
2.25.1