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hc

2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/include/linux/stop_machine.h
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@@ -24,20 +24,34 @@
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 struct cpu_stop_work {
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 	struct list_head	list;		/* cpu_stopper->works */
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 	cpu_stop_fn_t		fn;
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+	unsigned long		caller;
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 	void			*arg;
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 	struct cpu_stop_done	*done;
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-	/* Did not run due to disabled stopper; for nowait debug checks */
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-	bool			disabled;
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+};
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+
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+/*
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+ * Structure to determine completion condition and record errors.  May
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+ * be shared by works on different cpus.
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+ */
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+struct cpu_stop_done {
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+	atomic_t		nr_todo;	/* nr left to execute */
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+	int			ret;		/* collected return value */
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+	struct completion	completion;	/* fired if nr_todo reaches 0 */
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 };
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 int stop_one_cpu(unsigned int cpu, cpu_stop_fn_t fn, void *arg);
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 int stop_two_cpus(unsigned int cpu1, unsigned int cpu2, cpu_stop_fn_t fn, void *arg);
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 bool stop_one_cpu_nowait(unsigned int cpu, cpu_stop_fn_t fn, void *arg,
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 			 struct cpu_stop_work *work_buf);
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-int stop_cpus(const struct cpumask *cpumask, cpu_stop_fn_t fn, void *arg);
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-int try_stop_cpus(const struct cpumask *cpumask, cpu_stop_fn_t fn, void *arg);
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 void stop_machine_park(int cpu);
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 void stop_machine_unpark(int cpu);
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+void stop_machine_yield(const struct cpumask *cpumask);
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+int stop_one_cpu_async(unsigned int cpu, cpu_stop_fn_t fn, void *arg,
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+		       struct cpu_stop_work *work_buf,
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+		       struct cpu_stop_done *done);
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+void cpu_stop_work_wait(struct cpu_stop_work *work_buf);
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+
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+extern void print_stop_info(const char *log_lvl, struct task_struct *task);
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 #else	/* CONFIG_SMP */
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@@ -83,19 +97,7 @@
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 	return false;
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 }
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-static inline int stop_cpus(const struct cpumask *cpumask,
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-			    cpu_stop_fn_t fn, void *arg)
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-{
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-	if (cpumask_test_cpu(raw_smp_processor_id(), cpumask))
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-		return stop_one_cpu(raw_smp_processor_id(), fn, arg);
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-	return -ENOENT;
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-}
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-
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-static inline int try_stop_cpus(const struct cpumask *cpumask,
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-				cpu_stop_fn_t fn, void *arg)
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-{
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-	return stop_cpus(cpumask, fn, arg);
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-}
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+static inline void print_stop_info(const char *log_lvl, struct task_struct *task) { }
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 #endif	/* CONFIG_SMP */
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