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