cregit-Linux how code gets into the kernel

Release 4.12 include/linux/refcount.h

Directory: include/linux


#include <linux/atomic.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/kernel.h>

 * refcount_t - variant of atomic_t specialized for reference counts
 * @refs: atomic_t counter field
 * The counter saturates at UINT_MAX and will not move once
 * there. This avoids wrapping the counter and causing 'spurious'
 * use-after-free bugs.

typedef struct refcount_struct {
atomic_t refs;

} refcount_t;

#define REFCOUNT_INIT(n)	{ .refs = ATOMIC_INIT(n), }

 * refcount_set - set a refcount's value
 * @r: the refcount
 * @n: value to which the refcount will be set

static inline void refcount_set(refcount_t *r, unsigned int n) { atomic_set(&r->refs, n); }


Peter Zijlstra25100.00%1100.00%

/** * refcount_read - get a refcount's value * @r: the refcount * * Return: the refcount's value */
static inline unsigned int refcount_read(const refcount_t *r) { return atomic_read(&r->refs); }


Peter Zijlstra22100.00%1100.00%

extern __must_check bool refcount_add_not_zero(unsigned int i, refcount_t *r); extern void refcount_add(unsigned int i, refcount_t *r); extern __must_check bool refcount_inc_not_zero(refcount_t *r); extern void refcount_inc(refcount_t *r); extern __must_check bool refcount_sub_and_test(unsigned int i, refcount_t *r); extern void refcount_sub(unsigned int i, refcount_t *r); extern __must_check bool refcount_dec_and_test(refcount_t *r); extern void refcount_dec(refcount_t *r); extern __must_check bool refcount_dec_if_one(refcount_t *r); extern __must_check bool refcount_dec_not_one(refcount_t *r); extern __must_check bool refcount_dec_and_mutex_lock(refcount_t *r, struct mutex *lock); extern __must_check bool refcount_dec_and_lock(refcount_t *r, spinlock_t *lock); #endif /* _LINUX_REFCOUNT_H */

Overall Contributors

Peter Zijlstra22397.38%250.00%
Elena Reshetova31.31%125.00%
David Windsor31.31%125.00%
Directory: include/linux
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