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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - include/linux/spinlock_up.h
1 #ifndef __LINUX_SPINLOCK_UP_H
2 #define __LINUX_SPINLOCK_UP_H
4 #ifndef __LINUX_SPINLOCK_H
5 # error "please don't include this file directly"
9 * include/linux/spinlock_up.h - UP-debug version of spinlocks.
11 * portions Copyright 2005, Red Hat, Inc., Ingo Molnar
12 * Released under the General Public License (GPL).
14 * In the debug case, 1 means unlocked, 0 means locked. (the values
15 * are inverted, to catch initialization bugs)
17 * No atomicity anywhere, we are on UP.
20 #ifdef CONFIG_DEBUG_SPINLOCK
21 #define __raw_spin_is_locked(x) ((x)->slock == 0)
23 static inline void __raw_spin_lock(raw_spinlock_t
*lock
)
29 __raw_spin_lock_flags(raw_spinlock_t
*lock
, unsigned long flags
)
31 local_irq_save(flags
);
35 static inline int __raw_spin_trylock(raw_spinlock_t
*lock
)
37 char oldval
= lock
->slock
;
44 static inline void __raw_spin_unlock(raw_spinlock_t
*lock
)
50 * Read-write spinlocks. No debug version.
52 #define __raw_read_lock(lock) do { (void)(lock); } while (0)
53 #define __raw_write_lock(lock) do { (void)(lock); } while (0)
54 #define __raw_read_trylock(lock) ({ (void)(lock); 1; })
55 #define __raw_write_trylock(lock) ({ (void)(lock); 1; })
56 #define __raw_read_unlock(lock) do { (void)(lock); } while (0)
57 #define __raw_write_unlock(lock) do { (void)(lock); } while (0)
59 #else /* DEBUG_SPINLOCK */
60 #define __raw_spin_is_locked(lock) ((void)(lock), 0)
61 /* for sched.c and kernel_lock.c: */
62 # define __raw_spin_lock(lock) do { (void)(lock); } while (0)
63 # define __raw_spin_unlock(lock) do { (void)(lock); } while (0)
64 # define __raw_spin_trylock(lock) ({ (void)(lock); 1; })
65 #endif /* DEBUG_SPINLOCK */
67 #define __raw_read_can_lock(lock) (((void)(lock), 1))
68 #define __raw_write_can_lock(lock) (((void)(lock), 1))
70 #define __raw_spin_unlock_wait(lock) \
71 do { cpu_relax(); } while (__raw_spin_is_locked(lock))
73 #endif /* __LINUX_SPINLOCK_UP_H */