refcount.c (a976c2951d8f376112361830aa7762beff83a205) refcount.c (fd25d19f6b8da315332bb75936605fb45d3ea981)
1/*
2 * Variant of atomic_t specialized for reference counts.
3 *
4 * The interface matches the atomic_t interface (to aid in porting) but only
5 * provides the few functions one should use for reference counting.
6 *
7 * It differs in that the counter saturates at UINT_MAX and will not move once
8 * there. This avoids wrapping the counter and causing 'spurious'

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32 * Note that the allocator is responsible for ordering things between free()
33 * and alloc().
34 *
35 */
36
37#include <linux/refcount.h>
38#include <linux/bug.h>
39
1/*
2 * Variant of atomic_t specialized for reference counts.
3 *
4 * The interface matches the atomic_t interface (to aid in porting) but only
5 * provides the few functions one should use for reference counting.
6 *
7 * It differs in that the counter saturates at UINT_MAX and will not move once
8 * there. This avoids wrapping the counter and causing 'spurious'

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32 * Note that the allocator is responsible for ordering things between free()
33 * and alloc().
34 *
35 */
36
37#include <linux/refcount.h>
38#include <linux/bug.h>
39
40#ifdef CONFIG_REFCOUNT_FULL
41
40/**
41 * refcount_add_not_zero - add a value to a refcount unless it is 0
42 * @i: the value to add to the refcount
43 * @r: the refcount
44 *
45 * Will saturate at UINT_MAX and WARN.
46 *
47 * Provides no memory ordering, it is assumed the caller has guaranteed the

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220 * Provides release memory ordering, such that prior loads and stores are done
221 * before.
222 */
223void refcount_dec(refcount_t *r)
224{
225 WARN_ONCE(refcount_dec_and_test(r), "refcount_t: decrement hit 0; leaking memory.\n");
226}
227EXPORT_SYMBOL(refcount_dec);
42/**
43 * refcount_add_not_zero - add a value to a refcount unless it is 0
44 * @i: the value to add to the refcount
45 * @r: the refcount
46 *
47 * Will saturate at UINT_MAX and WARN.
48 *
49 * Provides no memory ordering, it is assumed the caller has guaranteed the

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222 * Provides release memory ordering, such that prior loads and stores are done
223 * before.
224 */
225void refcount_dec(refcount_t *r)
226{
227 WARN_ONCE(refcount_dec_and_test(r), "refcount_t: decrement hit 0; leaking memory.\n");
228}
229EXPORT_SYMBOL(refcount_dec);
230#endif /* CONFIG_REFCOUNT_FULL */
228
229/**
230 * refcount_dec_if_one - decrement a refcount if it is 1
231 * @r: the refcount
232 *
233 * No atomic_t counterpart, it attempts a 1 -> 0 transition and returns the
234 * success thereof.
235 *

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232/**
233 * refcount_dec_if_one - decrement a refcount if it is 1
234 * @r: the refcount
235 *
236 * No atomic_t counterpart, it attempts a 1 -> 0 transition and returns the
237 * success thereof.
238 *

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