[mirror_ubuntu-bionic-kernel.git] / include / asm-generic / qrwlock_types.h

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

#include <linux/types.h>
#include <asm/spinlock_types.h>

/*
 * The queue read/write lock data structure
 */

typedef struct qrwlock {
	union {
		atomic_t cnts;
		struct {
#ifdef __LITTLE_ENDIAN
			u8 wlocked;	/* Locked for write? */
			u8 __lstate[3];
#else
			u8 __lstate[3];
			u8 wlocked;	/* Locked for write? */
#endif
		};
	};
	arch_spinlock_t		wait_lock;
} arch_rwlock_t;

#define	__ARCH_RW_LOCK_UNLOCKED {		\
	{ .cnts = ATOMIC_INIT(0), },		\
	.wait_lock = __ARCH_SPIN_LOCK_UNLOCKED,	\
}

#endif /* __ASM_GENERIC_QRWLOCK_TYPES_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
70af2f8a WL	2	#ifndef __ASM_GENERIC_QRWLOCK_TYPES_H
	3	#define __ASM_GENERIC_QRWLOCK_TYPES_H
	4
	5	#include <linux/types.h>
	6	#include <asm/spinlock_types.h>
	7
	8	/*
	9	* The queue read/write lock data structure
	10	*/
	11
	12	typedef struct qrwlock {
e0d02285 WD	13	union {
	14	atomic_t cnts;
	15	struct {
	16	#ifdef __LITTLE_ENDIAN
d1331661 WD	17	u8 wlocked; /* Locked for write? */
d1331661 WD	18	u8 __lstate[3];
e0d02285	19	#else
d1331661 WD	20	u8 __lstate[3];
d1331661 WD	21	u8 wlocked; /* Locked for write? */
e0d02285 WD	22	#endif
	23	};
	24	};
6e1e5196	25	arch_spinlock_t wait_lock;
70af2f8a WL	26	} arch_rwlock_t;
	27
	28	#define __ARCH_RW_LOCK_UNLOCKED { \
e0d02285	29	{ .cnts = ATOMIC_INIT(0), }, \
6e1e5196	30	.wait_lock = __ARCH_SPIN_LOCK_UNLOCKED, \
70af2f8a WL	31	}
	32
	33	#endif /* __ASM_GENERIC_QRWLOCK_TYPES_H */