linux-kernel - [PATCH] sched_ext: Return NULL in llc

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Message-ID: <20250615200414.42827-1-yphbchou0911@gmail.com>
Date: Mon, 16 Jun 2025 04:04:14 +0800
From: Cheng-Yang Chou <yphbchou0911@...il.com>
To: linux-kernel@...r.kernel.org
Cc: tj@...nel.org,
	void@...ifault.com,
	arighi@...dia.com,
	changwoo@...lia.com,
	jserv@...s.ncku.edu.tw,
	yphbchou0911@...il.com
Subject: [PATCH] sched_ext: Return NULL in llc_span

Use NULL instead of 0 to signal no LLC domain, matching numa_span() and
the function comment.

No functional change.

Signed-off-by: Cheng-Yang Chou <yphbchou0911@...il.com>
---
 kernel/sched/ext_idle.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/ext_idle.c b/kernel/sched/ext_idle.c
index b79cbdb7999a..dfacb0ad9b6f 100644
--- a/kernel/sched/ext_idle.c
+++ b/kernel/sched/ext_idle.c
@@ -249,7 +249,7 @@ static struct cpumask *llc_span(s32 cpu)
 
 	sd = rcu_dereference(per_cpu(sd_llc, cpu));
 	if (!sd)
-		return 0;
+		return NULL;
 
 	return sched_domain_span(sd);
 }
-- 
2.48.1