linux-kernel - [patch 05/19] sched/mmcid: Move scheduler code out of global header

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Message-ID: <20251015172834.631482357@linutronix.de>
Date: Wed, 15 Oct 2025 19:29:32 +0200 (CEST)
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Peter Zijlstra <peterz@...radead.org>,
 Gabriele Monaco <gmonaco@...hat.com>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Michael Jeanson <mjeanson@...icios.com>,
 Jens Axboe <axboe@...nel.dk>,
 "Paul E. McKenney" <paulmck@...nel.org>,
 "Gautham R. Shenoy" <gautham.shenoy@....com>,
 Florian Weimer <fweimer@...hat.com>,
 Tim Chen <tim.c.chen@...el.com>,
 TCMalloc Team <tcmalloc-eng@...gle.com>
Subject: [patch 05/19] sched/mmcid: Move scheduler code out of global header

This is only used in the scheduler core code, so there is no point to have
it in a global header.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 include/linux/mm_types.h |   13 -------------
 kernel/sched/core.c      |   20 ++++++++++++++++++--
 2 files changed, 18 insertions(+), 15 deletions(-)

--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -1341,27 +1341,14 @@ static inline unsigned int mm_cid_size(v
 	return 2 * cpumask_size();	/* mm_cpus_allowed(), mm_cidmask(). */
 }
 
-static inline void mm_set_cpus_allowed(struct mm_struct *mm, const struct cpumask *cpumask)
-{
-	struct cpumask *mm_allowed = mm_cpus_allowed(mm);
-
-	if (!mm)
-		return;
-	/* The mm_cpus_allowed is the union of each thread allowed CPUs masks. */
-	guard(raw_spinlock)(&mm->mm_cid.lock);
-	cpumask_or(mm_allowed, mm_allowed, cpumask);
-	WRITE_ONCE(mm->mm_cid.nr_cpus_allowed, cpumask_weight(mm_allowed));
-}
 #else /* CONFIG_SCHED_MM_CID */
 static inline void mm_init_cid(struct mm_struct *mm, struct task_struct *p) { }
 static inline int mm_alloc_cid(struct mm_struct *mm, struct task_struct *p) { return 0; }
 static inline void mm_destroy_cid(struct mm_struct *mm) { }
-
 static inline unsigned int mm_cid_size(void)
 {
 	return 0;
 }
-static inline void mm_set_cpus_allowed(struct mm_struct *mm, const struct cpumask *cpumask) { }
 #endif /* CONFIG_SCHED_MM_CID */
 
 struct mmu_gather;
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -2704,6 +2704,8 @@ int push_cpu_stop(void *arg)
 	return 0;
 }
 
+static inline void mm_update_cpus_allowed(struct mm_struct *mm, const cpumask_t *affmask);
+
 /*
  * sched_class::set_cpus_allowed must do the below, but is not required to
  * actually call this function.
@@ -2763,7 +2765,7 @@ static void
 		put_prev_task(rq, p);
 
 	p->sched_class->set_cpus_allowed(p, ctx);
-	mm_set_cpus_allowed(p->mm, ctx->new_mask);
+	mm_update_cpus_allowed(p->mm, ctx->new_mask);
 
 	if (queued)
 		enqueue_task(rq, p, ENQUEUE_RESTORE | ENQUEUE_NOCLOCK);
@@ -10404,6 +10406,18 @@ void call_trace_sched_update_nr_running(
  * When a task exits, the MM CID held by the task is not longer required as
  * the task cannot return to user space.
  */
+static inline void mm_update_cpus_allowed(struct mm_struct *mm, const struct cpumask *affmsk)
+{
+	struct cpumask *mm_allowed = mm_cpus_allowed(mm);
+
+	if (!mm)
+		return;
+	/* The mm_cpus_allowed is the union of each thread allowed CPUs masks. */
+	guard(raw_spinlock)(&mm->mm_cid.lock);
+	cpumask_or(mm_allowed, mm_allowed, affmsk);
+	WRITE_ONCE(mm->mm_cid.nr_cpus_allowed, cpumask_weight(mm_allowed));
+}
+
 void sched_mm_cid_exit_signals(struct task_struct *t)
 {
 	struct mm_struct *mm = t->mm;
@@ -10443,7 +10457,9 @@ void sched_mm_cid_fork(struct task_struc
 	WARN_ON_ONCE(!t->mm || t->mm_cid.cid != MM_CID_UNSET);
 	t->mm_cid.active = 1;
 }
-#endif /* CONFIG_SCHED_MM_CID */
+#else /* CONFIG_SCHED_MM_CID */
+static inline void mm_update_cpus_allowed(struct mm_struct *mm, const struct cpumask *affmsk) { }
+#endif /* !CONFIG_SCHED_MM_CID */
 
 #ifdef CONFIG_SCHED_CLASS_EXT
 void sched_deq_and_put_task(struct task_struct *p, int queue_flags,