linux-kernel - [PATCH v2 02/11] sched: Move is_cpu

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250126101614.232388-3-changwoo@igalia.com>
Date: Sun, 26 Jan 2025 19:16:05 +0900
From: Changwoo Min <changwoo@...lia.com>
To: tj@...nel.org,
	void@...ifault.com,
	arighi@...dia.com
Cc: kernel-dev@...lia.com,
	linux-kernel@...r.kernel.org,
	Changwoo Min <changwoo@...lia.com>
Subject: [PATCH v2 02/11] sched: Move is_cpu_allowed() to the header

is_cpu_allowed() can be used to specific scheduling policies
(e.g., sched_ext), so move it to the header.

Signed-off-by: Changwoo Min <changwoo@...lia.com>
---
 kernel/sched/core.c  | 30 ------------------------------
 kernel/sched/sched.h | 30 ++++++++++++++++++++++++++++++
 2 files changed, 30 insertions(+), 30 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 901170708e2a..eaaee182999c 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -2427,36 +2427,6 @@ static inline bool rq_has_pinned_tasks(struct rq *rq)
 	return rq->nr_pinned;
 }
 
-/*
- * Per-CPU kthreads are allowed to run on !active && online CPUs, see
- * __set_cpus_allowed_ptr() and select_fallback_rq().
- */
-static inline bool is_cpu_allowed(struct task_struct *p, int cpu)
-{
-	/* When not in the task's cpumask, no point in looking further. */
-	if (!task_allowed_on_cpu(p, cpu))
-		return false;
-
-	/* migrate_disabled() must be allowed to finish. */
-	if (is_migration_disabled(p))
-		return cpu_online(cpu);
-
-	/* Non kernel threads are not allowed during either online or offline. */
-	if (!(p->flags & PF_KTHREAD))
-		return cpu_active(cpu);
-
-	/* KTHREAD_IS_PER_CPU is always allowed. */
-	if (kthread_is_per_cpu(p))
-		return cpu_online(cpu);
-
-	/* Regular kernel threads don't get to stay during offline. */
-	if (cpu_dying(cpu))
-		return false;
-
-	/* But are allowed during online. */
-	return cpu_online(cpu);
-}
-
 /*
  * This is how migration works:
  *
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 38e0e323dda2..30c401d940f4 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -2675,6 +2675,36 @@ static inline cpumask_t *alloc_user_cpus_ptr(int node)
 
 #endif /* !CONFIG_SMP */
 
+/*
+ * Per-CPU kthreads are allowed to run on !active && online CPUs, see
+ * __set_cpus_allowed_ptr() and select_fallback_rq().
+ */
+static inline bool is_cpu_allowed(struct task_struct *p, int cpu)
+{
+	/* When not in the task's cpumask, no point in looking further. */
+	if (!task_allowed_on_cpu(p, cpu))
+		return false;
+
+	/* migrate_disabled() must be allowed to finish. */
+	if (is_migration_disabled(p))
+		return cpu_online(cpu);
+
+	/* Non kernel threads are not allowed during either online or offline. */
+	if (!(p->flags & PF_KTHREAD))
+		return cpu_active(cpu);
+
+	/* KTHREAD_IS_PER_CPU is always allowed. */
+	if (kthread_is_per_cpu(p))
+		return cpu_online(cpu);
+
+	/* Regular kernel threads don't get to stay during offline. */
+	if (cpu_dying(cpu))
+		return false;
+
+	/* But are allowed during online. */
+	return cpu_online(cpu);
+}
+
 #ifdef CONFIG_CPU_IDLE
 
 static inline void idle_set_state(struct rq *rq,
-- 
2.48.1