1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ASM_GENERIC_QRWLOCK_TYPES_H
3#define __ASM_GENERIC_QRWLOCK_TYPES_H
4
5#include <linux/types.h>
6#include <asm/byteorder.h>
7#include <asm/spinlock_types.h>
8
9/*
10 * The queued read/write lock data structure
11 */
12
13typedef struct qrwlock {
14	union {
15		atomic_t cnts;
16		struct {
17#ifdef __LITTLE_ENDIAN
18			u8 wlocked;	/* Locked for write? */
19			u8 __lstate[3];
20#else
21			u8 __lstate[3];
22			u8 wlocked;	/* Locked for write? */
23#endif
24		};
25	};
26	arch_spinlock_t		wait_lock;
27} arch_rwlock_t;
28
29#define	__ARCH_RW_LOCK_UNLOCKED {		\
30	{ .cnts = ATOMIC_INIT(0), },		\
31	.wait_lock = __ARCH_SPIN_LOCK_UNLOCKED,	\
32}
33
34#endif /* __ASM_GENERIC_QRWLOCK_TYPES_H */
35