kernel/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 #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))
  15 typedef u8  __ticket_t;
  16 typedef u16 __ticketpair_t;
  17 #else
  18 typedef u16 __ticket_t;
  19 typedef 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 typedef struct arch_spinlock {
  27         union {
  28                 __ticketpair_t head_tail;
  29                 struct __raw_tickets {
  30                         __ticket_t head, tail;
  31                 } tickets;
  32         };
  33 } arch_spinlock_t;
  34
  35 #define __ARCH_SPIN_LOCK_UNLOCKED       { { 0 } }
  36
  37 #include <asm-generic/qrwlock_types.h>
  38
  39 #endif /* _ASM_X86_SPINLOCK_TYPES_H */