Release 4.7 include/asm-generic/mutex-dec.h
/*
* include/asm-generic/mutex-dec.h
*
* Generic implementation of the mutex fastpath, based on atomic
* decrement/increment.
*/
#ifndef _ASM_GENERIC_MUTEX_DEC_H
#define _ASM_GENERIC_MUTEX_DEC_H
/**
* __mutex_fastpath_lock - try to take the lock by moving the count
* from 1 to a 0 value
* @count: pointer of type atomic_t
* @fail_fn: function to call if the original value was not 1
*
* Change the count from 1 to a value lower than 1, and call <fail_fn> if
* it wasn't 1 originally. This function MUST leave the value lower than
* 1 even when the "1" assertion wasn't true.
*/
static inline void
__mutex_fastpath_lock(atomic_t *count, void (*fail_fn)(atomic_t *))
{
if (unlikely(atomic_dec_return_acquire(count) < 0))
fail_fn(count);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| nicolas pitre | nicolas pitre | 24 | 63.16% | 1 | 25.00% |
| harvey harrison | harvey harrison | 10 | 26.32% | 1 | 25.00% |
| ingo molnar | ingo molnar | 3 | 7.89% | 1 | 25.00% |
| davidlohr bueso | davidlohr bueso | 1 | 2.63% | 1 | 25.00% |
| Total | 38 | 100.00% | 4 | 100.00% |
/**
* __mutex_fastpath_lock_retval - try to take the lock by moving the count
* from 1 to a 0 value
* @count: pointer of type atomic_t
*
* Change the count from 1 to a value lower than 1. This function returns 0
* if the fastpath succeeds, or -1 otherwise.
*/
static inline int
__mutex_fastpath_lock_retval(atomic_t *count)
{
if (unlikely(atomic_dec_return_acquire(count) < 0))
return -1;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| ingo molnar | ingo molnar | 24 | 80.00% | 1 | 25.00% |
| harvey harrison | harvey harrison | 3 | 10.00% | 1 | 25.00% |
| maarten lankhorst | maarten lankhorst | 2 | 6.67% | 1 | 25.00% |
| davidlohr bueso | davidlohr bueso | 1 | 3.33% | 1 | 25.00% |
| Total | 30 | 100.00% | 4 | 100.00% |
/**
* __mutex_fastpath_unlock - try to promote the count from 0 to 1
* @count: pointer of type atomic_t
* @fail_fn: function to call if the original value was not 0
*
* Try to promote the count from 0 to 1. If it wasn't 0, call <fail_fn>.
* In the failure case, this function is allowed to either set the value to
* 1, or to set it to a value lower than 1.
*
* If the implementation sets it to a value of lower than 1, then the
* __mutex_slowpath_needs_to_unlock() macro needs to return 1, it needs
* to return 0 otherwise.
*/
static inline void
__mutex_fastpath_unlock(atomic_t *count, void (*fail_fn)(atomic_t *))
{
if (unlikely(atomic_inc_return_release(count) <= 0))
fail_fn(count);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| nicolas pitre | nicolas pitre | 24 | 63.16% | 1 | 25.00% |
| harvey harrison | harvey harrison | 10 | 26.32% | 1 | 25.00% |
| ingo molnar | ingo molnar | 3 | 7.89% | 1 | 25.00% |
| davidlohr bueso | davidlohr bueso | 1 | 2.63% | 1 | 25.00% |
| Total | 38 | 100.00% | 4 | 100.00% |
#define __mutex_slowpath_needs_to_unlock() 1
/**
* __mutex_fastpath_trylock - try to acquire the mutex, without waiting
*
* @count: pointer of type atomic_t
* @fail_fn: fallback function
*
* Change the count from 1 to a value lower than 1, and return 0 (failure)
* if it wasn't 1 originally, or return 1 (success) otherwise. This function
* MUST leave the value lower than 1 even when the "1" assertion wasn't true.
* Additionally, if the value was < 0 originally, this function must not leave
* it to 0 on failure.
*
* If the architecture has no effective trylock variant, it should call the
* <fail_fn> spinlock-based trylock variant unconditionally.
*/
static inline int
__mutex_fastpath_trylock(atomic_t *count, int (*fail_fn)(atomic_t *))
{
if (likely(atomic_cmpxchg_acquire(count, 1, 0) == 1))
return 1;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| ingo molnar | ingo molnar | 41 | 95.35% | 1 | 33.33% |
| linus torvalds | linus torvalds | 1 | 2.33% | 1 | 33.33% |
| davidlohr bueso | davidlohr bueso | 1 | 2.33% | 1 | 33.33% |
| Total | 43 | 100.00% | 3 | 100.00% |
#endif
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| ingo molnar | ingo molnar | 87 | 52.10% | 1 | 14.29% |
| nicolas pitre | nicolas pitre | 48 | 28.74% | 1 | 14.29% |
| harvey harrison | harvey harrison | 23 | 13.77% | 1 | 14.29% |
| davidlohr bueso | davidlohr bueso | 4 | 2.40% | 1 | 14.29% |
| maarten lankhorst | maarten lankhorst | 3 | 1.80% | 1 | 14.29% |
| uwe zeisberger | uwe zeisberger | 1 | 0.60% | 1 | 14.29% |
| linus torvalds | linus torvalds | 1 | 0.60% | 1 | 14.29% |
| Total | 167 | 100.00% | 7 | 100.00% |
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