linux-kernel - [tip: sched/core] sched: Simplify sysctl_sched_uclamp

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Date:   Mon, 14 Aug 2023 15:08:06 -0000
From:   "tip-bot2 for Peter Zijlstra" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Valentin Schneider <vschneid@...hat.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: sched/core] sched: Simplify sysctl_sched_uclamp_handler()

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     0f92cdf36f848f1c077924f857a49789e00331c0
Gitweb:        https://git.kernel.org/tip/0f92cdf36f848f1c077924f857a49789e00331c0
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Tue, 01 Aug 2023 22:41:23 +02:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Mon, 14 Aug 2023 17:01:24 +02:00

sched: Simplify sysctl_sched_uclamp_handler()

Use guards to reduce gotos and simplify control flow.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Valentin Schneider <vschneid@...hat.com>
Link: https://lore.kernel.org/r/20230801211811.896559109@infradead.org
---
 kernel/sched/core.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 6cda296..6e8a8e9 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1827,7 +1827,8 @@ static int sysctl_sched_uclamp_handler(struct ctl_table *table, int write,
 	int old_min, old_max, old_min_rt;
 	int result;
 
-	mutex_lock(&uclamp_mutex);
+	guard(mutex)(&uclamp_mutex);
+
 	old_min = sysctl_sched_uclamp_util_min;
 	old_max = sysctl_sched_uclamp_util_max;
 	old_min_rt = sysctl_sched_uclamp_util_min_rt_default;
@@ -1836,7 +1837,7 @@ static int sysctl_sched_uclamp_handler(struct ctl_table *table, int write,
 	if (result)
 		goto undo;
 	if (!write)
-		goto done;
+		return 0;
 
 	if (sysctl_sched_uclamp_util_min > sysctl_sched_uclamp_util_max ||
 	    sysctl_sched_uclamp_util_max > SCHED_CAPACITY_SCALE	||
@@ -1872,16 +1873,12 @@ static int sysctl_sched_uclamp_handler(struct ctl_table *table, int write,
 	 * Otherwise, keep it simple and do just a lazy update at each next
 	 * task enqueue time.
 	 */
-
-	goto done;
+	return 0;
 
 undo:
 	sysctl_sched_uclamp_util_min = old_min;
 	sysctl_sched_uclamp_util_max = old_max;
 	sysctl_sched_uclamp_util_min_rt_default = old_min_rt;
-done:
-	mutex_unlock(&uclamp_mutex);
-
 	return result;
 }
 #endif