linux-kernel - [PATCH] sched_ext: Use kvfree_rcu() to release per-cpu ksyncs object

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Message-ID: <20251117125311.107687-2-qiang.zhang@linux.dev>
Date: Mon, 17 Nov 2025 20:53:11 +0800
From: Zqiang <qiang.zhang@...ux.dev>
To: tj@...nel.org,
	void@...ifault.com,
	arighi@...dia.com,
	changwoo@...lia.com
Cc: sched-ext@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	qiang.zhang@...ux.dev,
	qiang.zhang1211@...il.com
Subject: [PATCH] sched_ext: Use kvfree_rcu() to release per-cpu ksyncs object

The free_kick_syncs_rcu() rcu-callback only invoke kvfree() to
release per-cpu ksyncs object, this can use kvfree_rcu() replace
call_rcu() to release per-cpu ksyncs object in the free_kick_syncs().

Signed-off-by: Zqiang <qiang.zhang@...ux.dev>
---
 kernel/sched/ext.c | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index c8de9ec70d75..fe94daea7889 100644
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -4161,13 +4161,6 @@ static const char *scx_exit_reason(enum scx_exit_kind kind)
 	}
 }
 
-static void free_kick_syncs_rcu(struct rcu_head *rcu)
-{
-	struct scx_kick_syncs *ksyncs = container_of(rcu, struct scx_kick_syncs, rcu);
-
-	kvfree(ksyncs);
-}
-
 static void free_kick_syncs(void)
 {
 	int cpu;
@@ -4178,7 +4171,7 @@ static void free_kick_syncs(void)
 
 		to_free = rcu_replace_pointer(*ksyncs, NULL, true);
 		if (to_free)
-			call_rcu(&to_free->rcu, free_kick_syncs_rcu);
+			kvfree_rcu(to_free, rcu);
 	}
 }
 
-- 
2.48.1