include/asm-generic/qrwlock_types.h

   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/spinlock_types.h>
   7
   8 /*
   9  * The queue read/write lock data structure
  10  */
  11
  12 typedef struct qrwlock {
  13         union {
  14                 atomic_t cnts;
  15                 struct {
  16 #ifdef __LITTLE_ENDIAN
  17                         u8 wlocked;     /* Locked for write? */
  18                         u8 __lstate[3];
  19 #else
  20                         u8 __lstate[3];
  21                         u8 wlocked;     /* Locked for write? */
  22 #endif
  23                 };
  24         };
  25         arch_spinlock_t         wait_lock;
  26 } arch_rwlock_t;
  27
  28 #define __ARCH_RW_LOCK_UNLOCKED {               \
  29         { .cnts = ATOMIC_INIT(0), },            \
  30         .wait_lock = __ARCH_SPIN_LOCK_UNLOCKED, \
  31 }
  32
  33 #endif /* __ASM_GENERIC_QRWLOCK_TYPES_H */