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sched/smp: Use the SMP version of idle_thread_set_boot_cpu()

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Simplify the scheduler by making the CONFIG_SMP=y version of
idle_thread_set_boot_cpu() unconditional.

Note that idle_thread_set_boot_cpu() is already conditional
on CONFIG_GENERIC_SMP_IDLE_THREAD, which most architectures
select unconditionally on both UP and SMP kernels.

Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Shrikanth Hegde <sshegde@linux.ibm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Valentin Schneider <vschneid@redhat.com>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Link: https://lore.kernel.org/r/20250528080924.2273858-28-mingo@kernel.org
This commit is contained in:
Ingo Molnar 2025-05-28 10:09:08 +02:00
parent 1f25730e5a
commit 74063c1755
2 changed files with 0 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

2
kernel/sched/core.c
View file

@ -8582,9 +8582,7 @@ void __init sched_init(void)
calc_load_update = jiffies + LOAD_FREQ; calc_load_update = jiffies + LOAD_FREQ;
#ifdef CONFIG_SMP
idle_thread_set_boot_cpu(); idle_thread_set_boot_cpu();
#endif
balance_push_set(smp_processor_id(), false); balance_push_set(smp_processor_id(), false);
init_sched_fair_class(); init_sched_fair_class();

4
kernel/smpboot.c
View file

@ -18,8 +18,6 @@
#include "smpboot.h" #include "smpboot.h"
#ifdef CONFIG_SMP
#ifdef CONFIG_GENERIC_SMP_IDLE_THREAD #ifdef CONFIG_GENERIC_SMP_IDLE_THREAD
/* /*
* For the hotplug case we keep the task structs around and reuse * For the hotplug case we keep the task structs around and reuse
@ -76,8 +74,6 @@ void __init idle_threads_init(void)
} }
#endif #endif
#endif /* #ifdef CONFIG_SMP */
static LIST_HEAD(hotplug_threads); static LIST_HEAD(hotplug_threads);
static DEFINE_MUTEX(smpboot_threads_lock); static DEFINE_MUTEX(smpboot_threads_lock);