arch/x86/include/asm/spinlock_types.h

   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 #else
   9 #define __TICKET_LOCK_INC       1
  10 #endif
  11
  12 #if (CONFIG_NR_CPUS < (256 / __TICKET_LOCK_INC))
  13 typedef u8  __ticket_t;
  14 typedef u16 __ticketpair_t;
  15 #else
  16 typedef u16 __ticket_t;
  17 typedef u32 __ticketpair_t;
  18 #endif
  19
  20 #define TICKET_LOCK_INC ((__ticket_t)__TICKET_LOCK_INC)
  21
  22 #define TICKET_SHIFT    (sizeof(__ticket_t) * 8)
  23
  24 typedef struct arch_spinlock {
  25         union {
  26                 __ticketpair_t head_tail;
  27                 struct __raw_tickets {
  28                         __ticket_t head, tail;
  29                 } tickets;
  30         };
  31 } arch_spinlock_t;
  32
  33 #define __ARCH_SPIN_LOCK_UNLOCKED       { { 0 } }
  34
  35 #include <asm/rwlock.h>
  36
  37 #endif /* _ASM_X86_SPINLOCK_TYPES_H */