1 /****************************************************************************
2  ****************************************************************************
3  ***
4  ***   This header was automatically generated from a Linux kernel header
5  ***   of the same name, to make information necessary for userspace to
6  ***   call into the kernel available to libc.  It contains only constants,
7  ***   structures, and macros generated from the original header, and thus,
8  ***   contains no copyrightable information.
9  ***
10  ****************************************************************************
11  ****************************************************************************/
12 #ifndef __ASM_SPINLOCK_H
13 #define __ASM_SPINLOCK_H
14 
15 #if __LINUX_ARM_ARCH__ < 6
16 #error SMP not supported on pre-ARMv6 CPUs
17 #endif
18 
19 #define __raw_spin_is_locked(x) ((x)->lock != 0)
20 #define __raw_spin_unlock_wait(lock)   do { while (__raw_spin_is_locked(lock)) cpu_relax(); } while (0)
21 
22 #define __raw_spin_lock_flags(lock, flags) __raw_spin_lock(lock)
23 
24 #define rwlock_is_locked(x) (*((volatile unsigned int *)(x)) != 0)
25 #define __raw_write_can_lock(x) ((x)->lock == 0x80000000)
26 #define __raw_read_can_lock(x) ((x)->lock < 0x80000000)
27 #endif
28