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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_SMP_TYPES_H
#define __LINUX_SMP_TYPES_H
#include <linux/llist.h>
enum {
CSD_FLAG_LOCK = 0x01,
IRQ_WORK_PENDING = 0x01,
IRQ_WORK_BUSY = 0x02,
IRQ_WORK_LAZY = 0x04, /* No IPI, wait for tick */
IRQ_WORK_HARD_IRQ = 0x08, /* IRQ context on PREEMPT_RT */
IRQ_WORK_CLAIMED = (IRQ_WORK_PENDING | IRQ_WORK_BUSY),
CSD_TYPE_ASYNC = 0x00,
CSD_TYPE_SYNC = 0x10,
CSD_TYPE_IRQ_WORK = 0x20,
CSD_TYPE_TTWU = 0x30,
CSD_FLAG_TYPE_MASK = 0xF0,
};
/*
* 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 {
struct llist_node llist;
union {
unsigned int u_flags;
atomic_t a_flags;
};
};
#endif /* __LINUX_SMP_TYPES_H */
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