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

#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 wmode;	/* Writer mode   */
			u8 rcnts[3];	/* Reader counts */
#else
			u8 rcnts[3];	/* Reader counts */
			u8 wmode;	/* Writer mode   */
#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
70af2f8a WL	1	#ifndef __ASM_GENERIC_QRWLOCK_TYPES_H
	2	#define __ASM_GENERIC_QRWLOCK_TYPES_H
	3
	4	#include <linux/types.h>
	5	#include <asm/spinlock_types.h>
	6
	7	/*
	8	* The queue read/write lock data structure
	9	*/
	10
	11	typedef struct qrwlock {
e0d02285 WD	12	union {
	13	atomic_t cnts;
	14	struct {
	15	#ifdef __LITTLE_ENDIAN
	16	u8 wmode; /* Writer mode */
	17	u8 rcnts[3]; /* Reader counts */
	18	#else
	19	u8 rcnts[3]; /* Reader counts */
	20	u8 wmode; /* Writer mode */
	21	#endif
	22	};
	23	};
6e1e5196	24	arch_spinlock_t wait_lock;
70af2f8a WL	25	} arch_rwlock_t;
	26
	27	#define __ARCH_RW_LOCK_UNLOCKED { \
e0d02285	28	{ .cnts = ATOMIC_INIT(0), }, \
6e1e5196	29	.wait_lock = __ARCH_SPIN_LOCK_UNLOCKED, \
70af2f8a WL	30	}
	31
	32	#endif /* __ASM_GENERIC_QRWLOCK_TYPES_H */