Commit 06ddd175 authored May 28, 2025 by Ingo Molnar

sched/smp: Always define is_percpu_thread() and scheduler_ipi()



Simplify the scheduler by making the CONFIG_SMP=y primitives
of is_percpu_thread() and scheduler_ipi() unconditional.

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/20250528080924.2273858-22-mingo@kernel.org

parent cac5cefb

include/linux/sched.h

+0 −8

Original line number	Diff line number	Diff line
		@@ -1765,12 +1765,8 @@ extern struct pid *cad_pid;

		static __always_inline bool is_percpu_thread(void)
		{
		#ifdef CONFIG_SMP
		return (current->flags & PF_NO_SETAFFINITY) &&
		(current->nr_cpus_allowed == 1);
		#else
		return true;
		#endif
		}

		/* Per-process atomic flags. */
		@@ -1967,7 +1963,6 @@ extern void __set_task_comm(struct task_struct tsk, const char from, bool exec
		buf; \
		})

		#ifdef CONFIG_SMP
		static __always_inline void scheduler_ipi(void)
		{
		/*
		@@ -1977,9 +1972,6 @@ static __always_inline void scheduler_ipi(void)
		*/
		preempt_fold_need_resched();
		}
		#else
		static inline void scheduler_ipi(void) { }
		#endif

		extern unsigned long wait_task_inactive(struct task_struct *, unsigned int match_state);