diff options
Diffstat (limited to 'include/linux/spinlock.h')
| -rw-r--r-- | include/linux/spinlock.h | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h index 61fef376ed2..a946176db63 100644 --- a/include/linux/spinlock.h +++ b/include/linux/spinlock.h @@ -283,6 +283,43 @@ do { \ }) /* + * Locks two spinlocks l1 and l2. + * l1_first indicates if spinlock l1 should be taken first. + */ +static inline void double_spin_lock(spinlock_t *l1, spinlock_t *l2, + bool l1_first) + __acquires(l1) + __acquires(l2) +{ + if (l1_first) { + spin_lock(l1); + spin_lock(l2); + } else { + spin_lock(l2); + spin_lock(l1); + } +} + +/* + * Unlocks two spinlocks l1 and l2. + * l1_taken_first indicates if spinlock l1 was taken first and therefore + * should be released after spinlock l2. + */ +static inline void double_spin_unlock(spinlock_t *l1, spinlock_t *l2, + bool l1_taken_first) + __releases(l1) + __releases(l2) +{ + if (l1_taken_first) { + spin_unlock(l2); + spin_unlock(l1); + } else { + spin_unlock(l1); + spin_unlock(l2); + } +} + +/* * Pull the atomic_t declaration: * (asm-mips/atomic.h needs above definitions) */ |