linux/include/linux/smp_types.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_SMP_TYPES_H
#define __LINUX_SMP_TYPES_H

#include <linux/llist.h>

enum { … };

/*
 * struct __call_single_node is the primary type on
 * smp.c:call_single_queue.
 *
 * flush_smp_call_function_queue() only reads the type from
 * __call_single_node::u_flags as a regular load, the above
 * (anonymous) enum defines all the bits of this word.
 *
 * Other bits are not modified until the type is known.
 *
 * CSD_TYPE_SYNC/ASYNC:
 *	struct {
 *		struct llist_node node;
 *		unsigned int flags;
 *		smp_call_func_t func;
 *		void *info;
 *	};
 *
 * CSD_TYPE_IRQ_WORK:
 *	struct {
 *		struct llist_node node;
 *		atomic_t flags;
 *		void (*func)(struct irq_work *);
 *	};
 *
 * CSD_TYPE_TTWU:
 *	struct {
 *		struct llist_node node;
 *		unsigned int flags;
 *	};
 *
 */

struct __call_single_node { … };

#endif /* __LINUX_SMP_TYPES_H */