spinlock_types.h

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#ifndef _ASM_SPINLOCK_TYPES_H
#define _ASM_SPINLOCK_TYPES_H

#ifndef __LINUX_SPINLOCK_TYPES_H
# error "please don't include this file directly"
#endif

#include <linux/types.h>

#include <asm/byteorder.h>

typedef union {
    /*
     * bits  0..15 : serving_now
     * bits 16..31 : ticket
     */
    u32 lock;
    struct {
#ifdef __BIG_ENDIAN
        u16 ticket;
        u16 serving_now;
#else
        u16 serving_now;
        u16 ticket;
#endif
    } h;
} arch_spinlock_t;

#define __ARCH_SPIN_LOCK_UNLOCKED   { .lock = 0 }

typedef struct {
    volatile unsigned int lock;
} arch_rwlock_t;

#define __ARCH_RW_LOCK_UNLOCKED     { 0 }

#endif