LXR linux/arch/x86/include/asm/spinlock

   1#ifndef _ASM_X86_SPINLOCK_TYPES_H
   2#define _ASM_X86_SPINLOCK_TYPES_H
   3
   4#include <linux/types.h>
   5
   6#ifdef CONFIG_PARAVIRT_SPINLOCKS
   7#define __TICKET_LOCK_INC       2
   8#define TICKET_SLOWPATH_FLAG    ((__ticket_t)1)
   9#else
  10#define __TICKET_LOCK_INC       1
  11#define TICKET_SLOWPATH_FLAG    ((__ticket_t)0)
  12#endif
  13
  14#if (CONFIG_NR_CPUS < (256 / __TICKET_LOCK_INC))
  15typedef u8  __ticket_t;
  16typedef u16 __ticketpair_t;
  17#else
  18typedef u16 __ticket_t;
  19typedef u32 __ticketpair_t;
  20#endif
  21
  22#define TICKET_LOCK_INC ((__ticket_t)__TICKET_LOCK_INC)
  23
  24#define TICKET_SHIFT    (sizeof(__ticket_t) * 8)
  25
  26#ifdef CONFIG_QUEUED_SPINLOCKS
  27#include <asm-generic/qspinlock_types.h>
  28#else
  29typedef struct arch_spinlock {
  30        union {
  31                __ticketpair_t head_tail;
  32                struct __raw_tickets {
  33                        __ticket_t head, tail;
  34                } tickets;
  35        };
  36} arch_spinlock_t;
  37
  38#define __ARCH_SPIN_LOCK_UNLOCKED       { { 0 } }
  39#endif /* CONFIG_QUEUED_SPINLOCKS */
  40
  41#include <asm-generic/qrwlock_types.h>
  42
  43#endif /* _ASM_X86_SPINLOCK_TYPES_H */
  44