linux-kernel - [PATCH 19/43] sched/smp: Always define sched_domains_mutex_lock()/unlock(), def_root_domain and sched_domains

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Message-ID: <20250528080924.2273858-20-mingo@kernel.org>
Date: Wed, 28 May 2025 10:09:00 +0200
From: Ingo Molnar <mingo@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: Dietmar Eggemann <dietmar.eggemann@....com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Shrikanth Hegde <sshegde@...ux.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Valentin Schneider <vschneid@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mel Gorman <mgorman@...e.de>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	Juri Lelli <juri.lelli@...hat.com>
Subject: [PATCH 19/43] sched/smp: Always define sched_domains_mutex_lock()/unlock(), def_root_domain and sched_domains_mutex

Simplify the scheduler by making formerly SMP-only primitives and data
structures unconditional.

Unconditionally build kernel/sched/topology.c and the main sched-domains
locking primitives.

Signed-off-by: Ingo Molnar <mingo@...nel.org>
Cc: Dietmar Eggemann <dietmar.eggemann@....com>
Cc: Juri Lelli <juri.lelli@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Mel Gorman <mgorman@...e.de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Shrikanth Hegde <sshegde@...ux.ibm.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Valentin Schneider <vschneid@...hat.com>
Cc: Vincent Guittot <vincent.guittot@...aro.org>
---
 include/linux/sched.h        | 5 -----
 kernel/sched/build_utility.c | 3 ++-
 kernel/sched/topology.c      | 4 ++++
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 45e5953b8f32..77fb5aa73d70 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -395,15 +395,10 @@ enum uclamp_id {
 	UCLAMP_CNT
 };
 
-#ifdef CONFIG_SMP
 extern struct root_domain def_root_domain;
 extern struct mutex sched_domains_mutex;
 extern void sched_domains_mutex_lock(void);
 extern void sched_domains_mutex_unlock(void);
-#else
-static inline void sched_domains_mutex_lock(void) { }
-static inline void sched_domains_mutex_unlock(void) { }
-#endif
 
 struct sched_param {
 	int sched_priority;
diff --git a/kernel/sched/build_utility.c b/kernel/sched/build_utility.c
index bf9d8db94b70..5c485b2dfb95 100644
--- a/kernel/sched/build_utility.c
+++ b/kernel/sched/build_utility.c
@@ -83,9 +83,10 @@
 #ifdef CONFIG_SMP
 # include "cpupri.c"
 # include "stop_task.c"
-# include "topology.c"
 #endif
 
+#include "topology.c"
+
 #ifdef CONFIG_SCHED_CORE
 # include "core_sched.c"
 #endif
diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index 4f52b8e56c19..7ce0bac86e94 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -15,6 +15,8 @@ void sched_domains_mutex_unlock(void)
 	mutex_unlock(&sched_domains_mutex);
 }
 
+#ifdef CONFIG_SMP
+
 /* Protected by sched_domains_mutex: */
 static cpumask_var_t sched_domains_tmpmask;
 static cpumask_var_t sched_domains_tmpmask2;
@@ -2855,3 +2857,5 @@ void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
 	partition_sched_domains_locked(ndoms_new, doms_new, dattr_new);
 	sched_domains_mutex_unlock();
 }
+
+#endif /* CONFIG_SMP */
-- 
2.45.2