1 files changed, 80 insertions, 0 deletions
diff --git a/include/linux/sched/isolation.h b/include/linux/sched/isolation.h
new file mode 100644
index 000000000000..d8501f4709b5
--- /dev/null
+++ b/include/linux/sched/isolation.h
@@ -0,0 +1,80 @@
+#ifndef _LINUX_SCHED_ISOLATION_H
+#define _LINUX_SCHED_ISOLATION_H
+
+#include <linux/cpumask.h>
+#include <linux/cpuset.h>
+#include <linux/init.h>
+#include <linux/tick.h>
+
+enum hk_type {
+	HK_TYPE_DOMAIN,
+	HK_TYPE_MANAGED_IRQ,
+	HK_TYPE_KERNEL_NOISE,
+	HK_TYPE_MAX,
+
+	/*
+	 * The following housekeeping types are only set by the nohz_full
+	 * boot commandline option. So they can share the same value.
+	 */
+	HK_TYPE_TICK    = HK_TYPE_KERNEL_NOISE,
+	HK_TYPE_TIMER   = HK_TYPE_KERNEL_NOISE,
+	HK_TYPE_RCU     = HK_TYPE_KERNEL_NOISE,
+	HK_TYPE_MISC    = HK_TYPE_KERNEL_NOISE,
+	HK_TYPE_WQ      = HK_TYPE_KERNEL_NOISE,
+	HK_TYPE_KTHREAD = HK_TYPE_KERNEL_NOISE
+};
+
+#ifdef CONFIG_CPU_ISOLATION
+DECLARE_STATIC_KEY_FALSE(housekeeping_overridden);
+extern int housekeeping_any_cpu(enum hk_type type);
+extern const struct cpumask *housekeeping_cpumask(enum hk_type type);
+extern bool housekeeping_enabled(enum hk_type type);
+extern void housekeeping_affine(struct task_struct *t, enum hk_type type);
+extern bool housekeeping_test_cpu(int cpu, enum hk_type type);
+extern void __init housekeeping_init(void);
+
+#else
+
+static inline int housekeeping_any_cpu(enum hk_type type)
+{
+	return smp_processor_id();
+}
+
+static inline const struct cpumask *housekeeping_cpumask(enum hk_type type)
+{
+	return cpu_possible_mask;
+}
+
+static inline bool housekeeping_enabled(enum hk_type type)
+{
+	return false;
+}
+
+static inline void housekeeping_affine(struct task_struct *t,
+				       enum hk_type type) { }
+
+static inline bool housekeeping_test_cpu(int cpu, enum hk_type type)
+{
+	return true;
+}
+
+static inline void housekeeping_init(void) { }
+#endif /* CONFIG_CPU_ISOLATION */
+
+static inline bool housekeeping_cpu(int cpu, enum hk_type type)
+{
+#ifdef CONFIG_CPU_ISOLATION
+	if (static_branch_unlikely(&housekeeping_overridden))
+		return housekeeping_test_cpu(cpu, type);
+#endif
+	return true;
+}
+
+static inline bool cpu_is_isolated(int cpu)
+{
+	return !housekeeping_test_cpu(cpu, HK_TYPE_DOMAIN) ||
+	       !housekeeping_test_cpu(cpu, HK_TYPE_TICK) ||
+	       cpuset_cpu_is_isolated(cpu);
+}
+
+#endif /* _LINUX_SCHED_ISOLATION_H */