linux-kernel - [PATCH 27/43] sched/smp: Use the SMP version of idle_thread_set_boot

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Message-ID: <20250528080924.2273858-28-mingo@kernel.org>
Date: Wed, 28 May 2025 10:09:08 +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 27/43] sched/smp: Use the SMP version of idle_thread_set_boot_cpu()

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

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>
---
 kernel/sched/core.c | 2 --
 kernel/smpboot.c    | 4 ----
 2 files changed, 6 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index ac933e6fc465..d2d3e5e337c7 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -8577,9 +8577,7 @@ void __init sched_init(void)
 
 	calc_load_update = jiffies + LOAD_FREQ;
 
-#ifdef CONFIG_SMP
 	idle_thread_set_boot_cpu();
-#endif
 
 	balance_push_set(smp_processor_id(), false);
 	init_sched_fair_class();
diff --git a/kernel/smpboot.c b/kernel/smpboot.c
index 1992b62e980b..4503b60ce9bd 100644
--- a/kernel/smpboot.c
+++ b/kernel/smpboot.c
@@ -18,8 +18,6 @@
 
 #include "smpboot.h"
 
-#ifdef CONFIG_SMP
-
 #ifdef CONFIG_GENERIC_SMP_IDLE_THREAD
 /*
  * For the hotplug case we keep the task structs around and reuse
@@ -76,8 +74,6 @@ void __init idle_threads_init(void)
 }
 #endif
 
-#endif /* #ifdef CONFIG_SMP */
-
 static LIST_HEAD(hotplug_threads);
 static DEFINE_MUTEX(smpboot_threads_lock);
 
-- 
2.45.2