diff options
Diffstat (limited to 'include/linux/six.h')
| -rw-r--r-- | include/linux/six.h | 58 |
1 files changed, 10 insertions, 48 deletions
diff --git a/include/linux/six.h b/include/linux/six.h index 40e213f2fb40..0fb1b2f49345 100644 --- a/include/linux/six.h +++ b/include/linux/six.h @@ -1,4 +1,4 @@ -// SPDX-License-Identifier: GPL-2.0 +/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _LINUX_SIX_H #define _LINUX_SIX_H @@ -50,12 +50,12 @@ * six_trylock_convert(lock, from, to) * * A lock may be held multiple types by the same thread (for read or intent, - * not write) - up to SIX_LOCK_MAX_RECURSE. However, the six locks code does - * _not_ implement the actual recursive checks itself though - rather, if your - * code (e.g. btree iterator code) knows that the current thread already has a - * lock held, and for the correct type, six_lock_increment() may be used to - * bump up the counter for that type - the only effect is that one more call to - * unlock will be required before the lock is unlocked. + * not write). However, the six locks code does _not_ implement the actual + * recursive checks itself though - rather, if your code (e.g. btree iterator + * code) knows that the current thread already has a lock held, and for the + * correct type, six_lock_increment() may be used to bump up the counter for + * that type - the only effect is that one more call to unlock will be required + * before the lock is unlocked. */ #include <linux/lockdep.h> @@ -80,8 +80,8 @@ union six_lock_state { }; struct { - unsigned read_lock:26; - unsigned intent_lock:3; + unsigned read_lock:28; + unsigned intent_lock:1; unsigned waiters:3; /* * seq works much like in seqlocks: it's incremented every time @@ -96,8 +96,6 @@ union six_lock_state { }; }; -#define SIX_LOCK_MAX_RECURSE ((1 << 3) - 1) - enum six_lock_type { SIX_LOCK_read, SIX_LOCK_intent, @@ -106,6 +104,7 @@ enum six_lock_type { struct six_lock { union six_lock_state state; + unsigned intent_lock_recurse; struct task_struct *owner; struct optimistic_spin_queue osq; @@ -139,8 +138,6 @@ do { \ #define __SIX_VAL(field, _v) (((union six_lock_state) { .field = _v }).v) -#ifdef SIX_LOCK_SEPARATE_LOCKFNS - #define __SIX_LOCK(type) \ bool six_trylock_##type(struct six_lock *); \ bool six_relock_##type(struct six_lock *, u32); \ @@ -185,41 +182,6 @@ static inline void six_unlock_type(struct six_lock *lock, enum six_lock_type typ SIX_LOCK_DISPATCH(type, six_unlock, lock); } -#else - -bool six_trylock_type(struct six_lock *, enum six_lock_type); -bool six_relock_type(struct six_lock *, enum six_lock_type, unsigned); -void six_lock_type(struct six_lock *, enum six_lock_type); -void six_unlock_type(struct six_lock *, enum six_lock_type); - -#define __SIX_LOCK(type) \ -static __always_inline bool six_trylock_##type(struct six_lock *lock) \ -{ \ - return six_trylock_type(lock, SIX_LOCK_##type); \ -} \ - \ -static __always_inline bool six_relock_##type(struct six_lock *lock, u32 seq)\ -{ \ - return six_relock_type(lock, SIX_LOCK_##type, seq); \ -} \ - \ -static __always_inline void six_lock_##type(struct six_lock *lock) \ -{ \ - six_lock_type(lock, SIX_LOCK_##type); \ -} \ - \ -static __always_inline void six_unlock_##type(struct six_lock *lock) \ -{ \ - six_unlock_type(lock, SIX_LOCK_##type); \ -} - -__SIX_LOCK(read) -__SIX_LOCK(intent) -__SIX_LOCK(write) -#undef __SIX_LOCK - -#endif - void six_lock_downgrade(struct six_lock *); bool six_lock_tryupgrade(struct six_lock *); bool six_trylock_convert(struct six_lock *, enum six_lock_type, |