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