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linux-7.2.3/arch/riscv/include/asm/cpu_ops.h

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+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2020 Western Digital Corporation or its affiliates.
+ * Based on arch/arm64/include/asm/cpu_ops.h
+ */
+#ifndef __ASM_CPU_OPS_H
+#define __ASM_CPU_OPS_H
+
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/threads.h>
+
+/**
+ * struct cpu_operations - Callback operations for hotplugging CPUs.
+ *
+ * @cpu_start:		Boots a cpu into the kernel.
+ * @cpu_stop:		Makes a cpu leave the kernel. Must not fail. Called from
+ *			the cpu being stopped.
+ * @cpu_is_stopped:	Ensures a cpu has left the kernel. Called from another
+ *			cpu.
+ */
+struct cpu_operations {
+	int		(*cpu_start)(unsigned int cpu,
+				     struct task_struct *tidle);
+#ifdef CONFIG_HOTPLUG_CPU
+	void		(*cpu_stop)(void);
+	bool		(*cpu_is_stopped)(unsigned int cpu);
+#endif
+};
+
+extern const struct cpu_operations cpu_ops_spinwait;
+extern const struct cpu_operations *cpu_ops;
+void __init cpu_set_ops(void);
+
+#endif /* ifndef __ASM_CPU_OPS_H */