arch/x86/include/asm/spinlock_types.h

   1 #ifndef _ASM_X86_SPINLOCK_TYPES_H
   2 #define _ASM_X86_SPINLOCK_TYPES_H
   3
   4 #ifndef __LINUX_SPINLOCK_TYPES_H
   5 # error "please don't include this file directly"
   6 #endif
   7
   8 #include <linux/types.h>
   9
  10 #if (CONFIG_NR_CPUS < 256)
  11 typedef u8  __ticket_t;
  12 #else
  13 typedef u16 __ticket_t;
  14 #endif
  15
  16 #define TICKET_SHIFT    (sizeof(__ticket_t) * 8)
  17 #define TICKET_MASK     ((__ticket_t)((1 << TICKET_SHIFT) - 1))
  18
  19 typedef struct arch_spinlock {
  20         union {
  21                 unsigned int slock;
  22                 struct __raw_tickets {
  23                         __ticket_t head, tail;
  24                 } tickets;
  25         };
  26 } arch_spinlock_t;
  27
  28 #define __ARCH_SPIN_LOCK_UNLOCKED       { { .slock = 0 } }
  29
  30 #include <asm/rwlock.h>
  31
  32 #endif /* _ASM_X86_SPINLOCK_TYPES_H */