#ifndef _LINUX_REFCOUNT_H
#define _LINUX_REFCOUNT_H
-/*
- * Variant of atomic_t specialized for reference counts.
- *
- * The interface matches the atomic_t interface (to aid in porting) but only
- * provides the few functions one should use for reference counting.
- *
- * It differs in that the counter saturates at UINT_MAX and will not move once
- * there. This avoids wrapping the counter and causing 'spurious'
- * use-after-free issues.
- *
- * Memory ordering rules are slightly relaxed wrt regular atomic_t functions
- * and provide only what is strictly required for refcounts.
- *
- * The increments are fully relaxed; these will not provide ordering. The
- * rationale is that whatever is used to obtain the object we're increasing the
- * reference count on will provide the ordering. For locked data structures,
- * its the lock acquire, for RCU/lockless data structures its the dependent
- * load.
- *
- * Do note that inc_not_zero() provides a control dependency which will order
- * future stores against the inc, this ensures we'll never modify the object
- * if we did not in fact acquire a reference.
- *
- * The decrements will provide release order, such that all the prior loads and
- * stores will be issued before, it also provides a control dependency, which
- * will order us against the subsequent free().
- *
- * The control dependency is against the load of the cmpxchg (ll/sc) that
- * succeeded. This means the stores aren't fully ordered, but this is fine
- * because the 1->0 transition indicates no concurrency.
- *
- * Note that the allocator is responsible for ordering things between free()
- * and alloc().
- *
- */
-
#include <linux/atomic.h>
-#include <linux/bug.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
-#ifdef CONFIG_DEBUG_REFCOUNT
-#define REFCOUNT_WARN(cond, str) WARN_ON(cond)
-#define __refcount_check __must_check
-#else
-#define REFCOUNT_WARN(cond, str) (void)(cond)
-#define __refcount_check
-#endif
-
typedef struct refcount_struct {
atomic_t refs;
} refcount_t;
return atomic_read(&r->refs);
}
-static inline __refcount_check
-bool refcount_add_not_zero(unsigned int i, refcount_t *r)
-{
- unsigned int old, new, val = atomic_read(&r->refs);
-
- for (;;) {
- if (!val)
- return false;
-
- if (unlikely(val == UINT_MAX))
- return true;
-
- new = val + i;
- if (new < val)
- new = UINT_MAX;
- old = atomic_cmpxchg_relaxed(&r->refs, val, new);
- if (old == val)
- break;
-
- val = old;
- }
-
- REFCOUNT_WARN(new == UINT_MAX, "refcount_t: saturated; leaking memory.\n");
-
- return true;
-}
-
-static inline void refcount_add(unsigned int i, refcount_t *r)
-{
- REFCOUNT_WARN(!refcount_add_not_zero(i, r), "refcount_t: addition on 0; use-after-free.\n");
-}
-
-/*
- * Similar to atomic_inc_not_zero(), will saturate at UINT_MAX and WARN.
- *
- * Provides no memory ordering, it is assumed the caller has guaranteed the
- * object memory to be stable (RCU, etc.). It does provide a control dependency
- * and thereby orders future stores. See the comment on top.
- */
-static inline __refcount_check
-bool refcount_inc_not_zero(refcount_t *r)
-{
- unsigned int old, new, val = atomic_read(&r->refs);
-
- for (;;) {
- new = val + 1;
-
- if (!val)
- return false;
-
- if (unlikely(!new))
- return true;
-
- old = atomic_cmpxchg_relaxed(&r->refs, val, new);
- if (old == val)
- break;
-
- val = old;
- }
-
- REFCOUNT_WARN(new == UINT_MAX, "refcount_t: saturated; leaking memory.\n");
-
- return true;
-}
-
-/*
- * Similar to atomic_inc(), will saturate at UINT_MAX and WARN.
- *
- * Provides no memory ordering, it is assumed the caller already has a
- * reference on the object, will WARN when this is not so.
- */
-static inline void refcount_inc(refcount_t *r)
-{
- REFCOUNT_WARN(!refcount_inc_not_zero(r), "refcount_t: increment on 0; use-after-free.\n");
-}
-
-/*
- * Similar to atomic_dec_and_test(), it will WARN on underflow and fail to
- * decrement when saturated at UINT_MAX.
- *
- * Provides release memory ordering, such that prior loads and stores are done
- * before, and provides a control dependency such that free() must come after.
- * See the comment on top.
- */
-static inline __refcount_check
-bool refcount_sub_and_test(unsigned int i, refcount_t *r)
-{
- unsigned int old, new, val = atomic_read(&r->refs);
-
- for (;;) {
- if (unlikely(val == UINT_MAX))
- return false;
-
- new = val - i;
- if (new > val) {
- REFCOUNT_WARN(new > val, "refcount_t: underflow; use-after-free.\n");
- return false;
- }
-
- old = atomic_cmpxchg_release(&r->refs, val, new);
- if (old == val)
- break;
-
- val = old;
- }
-
- return !new;
-}
-
-static inline __refcount_check
-bool refcount_dec_and_test(refcount_t *r)
-{
- return refcount_sub_and_test(1, r);
-}
+extern __must_check bool refcount_add_not_zero(unsigned int i, refcount_t *r);
+extern void refcount_add(unsigned int i, refcount_t *r);
-/*
- * Similar to atomic_dec(), it will WARN on underflow and fail to decrement
- * when saturated at UINT_MAX.
- *
- * Provides release memory ordering, such that prior loads and stores are done
- * before.
- */
-static inline
-void refcount_dec(refcount_t *r)
-{
- REFCOUNT_WARN(refcount_dec_and_test(r), "refcount_t: decrement hit 0; leaking memory.\n");
-}
-
-/*
- * No atomic_t counterpart, it attempts a 1 -> 0 transition and returns the
- * success thereof.
- *
- * Like all decrement operations, it provides release memory order and provides
- * a control dependency.
- *
- * It can be used like a try-delete operator; this explicit case is provided
- * and not cmpxchg in generic, because that would allow implementing unsafe
- * operations.
- */
-static inline __refcount_check
-bool refcount_dec_if_one(refcount_t *r)
-{
- return atomic_cmpxchg_release(&r->refs, 1, 0) == 1;
-}
-
-/*
- * No atomic_t counterpart, it decrements unless the value is 1, in which case
- * it will return false.
- *
- * Was often done like: atomic_add_unless(&var, -1, 1)
- */
-static inline __refcount_check
-bool refcount_dec_not_one(refcount_t *r)
-{
- unsigned int old, new, val = atomic_read(&r->refs);
+extern __must_check bool refcount_inc_not_zero(refcount_t *r);
+extern void refcount_inc(refcount_t *r);
- for (;;) {
- if (unlikely(val == UINT_MAX))
- return true;
+extern __must_check bool refcount_sub_and_test(unsigned int i, refcount_t *r);
+extern void refcount_sub(unsigned int i, refcount_t *r);
- if (val == 1)
- return false;
+extern __must_check bool refcount_dec_and_test(refcount_t *r);
+extern void refcount_dec(refcount_t *r);
- new = val - 1;
- if (new > val) {
- REFCOUNT_WARN(new > val, "refcount_t: underflow; use-after-free.\n");
- return true;
- }
-
- old = atomic_cmpxchg_release(&r->refs, val, new);
- if (old == val)
- break;
-
- val = old;
- }
-
- return true;
-}
-
-/*
- * Similar to atomic_dec_and_mutex_lock(), it will WARN on underflow and fail
- * to decrement when saturated at UINT_MAX.
- *
- * Provides release memory ordering, such that prior loads and stores are done
- * before, and provides a control dependency such that free() must come after.
- * See the comment on top.
- */
-static inline __refcount_check
-bool refcount_dec_and_mutex_lock(refcount_t *r, struct mutex *lock)
-{
- if (refcount_dec_not_one(r))
- return false;
-
- mutex_lock(lock);
- if (!refcount_dec_and_test(r)) {
- mutex_unlock(lock);
- return false;
- }
-
- return true;
-}
-
-/*
- * Similar to atomic_dec_and_lock(), it will WARN on underflow and fail to
- * decrement when saturated at UINT_MAX.
- *
- * Provides release memory ordering, such that prior loads and stores are done
- * before, and provides a control dependency such that free() must come after.
- * See the comment on top.
- */
-static inline __refcount_check
-bool refcount_dec_and_lock(refcount_t *r, spinlock_t *lock)
-{
- if (refcount_dec_not_one(r))
- return false;
-
- spin_lock(lock);
- if (!refcount_dec_and_test(r)) {
- spin_unlock(lock);
- return false;
- }
-
- return true;
-}
+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 */
--- /dev/null
+/*
+ * Variant of atomic_t specialized for reference counts.
+ *
+ * The interface matches the atomic_t interface (to aid in porting) but only
+ * provides the few functions one should use for reference counting.
+ *
+ * It differs in that the counter saturates at UINT_MAX and will not move once
+ * there. This avoids wrapping the counter and causing 'spurious'
+ * use-after-free issues.
+ *
+ * Memory ordering rules are slightly relaxed wrt regular atomic_t functions
+ * and provide only what is strictly required for refcounts.
+ *
+ * The increments are fully relaxed; these will not provide ordering. The
+ * rationale is that whatever is used to obtain the object we're increasing the
+ * reference count on will provide the ordering. For locked data structures,
+ * its the lock acquire, for RCU/lockless data structures its the dependent
+ * load.
+ *
+ * Do note that inc_not_zero() provides a control dependency which will order
+ * future stores against the inc, this ensures we'll never modify the object
+ * if we did not in fact acquire a reference.
+ *
+ * The decrements will provide release order, such that all the prior loads and
+ * stores will be issued before, it also provides a control dependency, which
+ * will order us against the subsequent free().
+ *
+ * The control dependency is against the load of the cmpxchg (ll/sc) that
+ * succeeded. This means the stores aren't fully ordered, but this is fine
+ * because the 1->0 transition indicates no concurrency.
+ *
+ * Note that the allocator is responsible for ordering things between free()
+ * and alloc().
+ *
+ */
+
+#include <linux/refcount.h>
+#include <linux/bug.h>
+
+bool refcount_add_not_zero(unsigned int i, refcount_t *r)
+{
+ unsigned int old, new, val = atomic_read(&r->refs);
+
+ for (;;) {
+ if (!val)
+ return false;
+
+ if (unlikely(val == UINT_MAX))
+ return true;
+
+ new = val + i;
+ if (new < val)
+ new = UINT_MAX;
+ old = atomic_cmpxchg_relaxed(&r->refs, val, new);
+ if (old == val)
+ break;
+
+ val = old;
+ }
+
+ WARN(new == UINT_MAX, "refcount_t: saturated; leaking memory.\n");
+
+ return true;
+}
+EXPORT_SYMBOL_GPL(refcount_add_not_zero);
+
+void refcount_add(unsigned int i, refcount_t *r)
+{
+ WARN(!refcount_add_not_zero(i, r), "refcount_t: addition on 0; use-after-free.\n");
+}
+EXPORT_SYMBOL_GPL(refcount_add);
+
+/*
+ * Similar to atomic_inc_not_zero(), will saturate at UINT_MAX and WARN.
+ *
+ * Provides no memory ordering, it is assumed the caller has guaranteed the
+ * object memory to be stable (RCU, etc.). It does provide a control dependency
+ * and thereby orders future stores. See the comment on top.
+ */
+bool refcount_inc_not_zero(refcount_t *r)
+{
+ unsigned int old, new, val = atomic_read(&r->refs);
+
+ for (;;) {
+ new = val + 1;
+
+ if (!val)
+ return false;
+
+ if (unlikely(!new))
+ return true;
+
+ old = atomic_cmpxchg_relaxed(&r->refs, val, new);
+ if (old == val)
+ break;
+
+ val = old;
+ }
+
+ WARN(new == UINT_MAX, "refcount_t: saturated; leaking memory.\n");
+
+ return true;
+}
+EXPORT_SYMBOL_GPL(refcount_inc_not_zero);
+
+/*
+ * Similar to atomic_inc(), will saturate at UINT_MAX and WARN.
+ *
+ * Provides no memory ordering, it is assumed the caller already has a
+ * reference on the object, will WARN when this is not so.
+ */
+void refcount_inc(refcount_t *r)
+{
+ WARN(!refcount_inc_not_zero(r), "refcount_t: increment on 0; use-after-free.\n");
+}
+EXPORT_SYMBOL_GPL(refcount_inc);
+
+bool refcount_sub_and_test(unsigned int i, refcount_t *r)
+{
+ unsigned int old, new, val = atomic_read(&r->refs);
+
+ for (;;) {
+ if (unlikely(val == UINT_MAX))
+ return false;
+
+ new = val - i;
+ if (new > val) {
+ WARN(new > val, "refcount_t: underflow; use-after-free.\n");
+ return false;
+ }
+
+ old = atomic_cmpxchg_release(&r->refs, val, new);
+ if (old == val)
+ break;
+
+ val = old;
+ }
+
+ return !new;
+}
+EXPORT_SYMBOL_GPL(refcount_sub_and_test);
+
+/*
+ * Similar to atomic_dec_and_test(), it will WARN on underflow and fail to
+ * decrement when saturated at UINT_MAX.
+ *
+ * Provides release memory ordering, such that prior loads and stores are done
+ * before, and provides a control dependency such that free() must come after.
+ * See the comment on top.
+ */
+bool refcount_dec_and_test(refcount_t *r)
+{
+ return refcount_sub_and_test(1, r);
+}
+EXPORT_SYMBOL_GPL(refcount_dec_and_test);
+
+/*
+ * Similar to atomic_dec(), it will WARN on underflow and fail to decrement
+ * when saturated at UINT_MAX.
+ *
+ * Provides release memory ordering, such that prior loads and stores are done
+ * before.
+ */
+
+void refcount_dec(refcount_t *r)
+{
+ WARN(refcount_dec_and_test(r), "refcount_t: decrement hit 0; leaking memory.\n");
+}
+EXPORT_SYMBOL_GPL(refcount_dec);
+
+/*
+ * No atomic_t counterpart, it attempts a 1 -> 0 transition and returns the
+ * success thereof.
+ *
+ * Like all decrement operations, it provides release memory order and provides
+ * a control dependency.
+ *
+ * It can be used like a try-delete operator; this explicit case is provided
+ * and not cmpxchg in generic, because that would allow implementing unsafe
+ * operations.
+ */
+bool refcount_dec_if_one(refcount_t *r)
+{
+ return atomic_cmpxchg_release(&r->refs, 1, 0) == 1;
+}
+EXPORT_SYMBOL_GPL(refcount_dec_if_one);
+
+/*
+ * No atomic_t counterpart, it decrements unless the value is 1, in which case
+ * it will return false.
+ *
+ * Was often done like: atomic_add_unless(&var, -1, 1)
+ */
+bool refcount_dec_not_one(refcount_t *r)
+{
+ unsigned int old, new, val = atomic_read(&r->refs);
+
+ for (;;) {
+ if (unlikely(val == UINT_MAX))
+ return true;
+
+ if (val == 1)
+ return false;
+
+ new = val - 1;
+ if (new > val) {
+ WARN(new > val, "refcount_t: underflow; use-after-free.\n");
+ return true;
+ }
+
+ old = atomic_cmpxchg_release(&r->refs, val, new);
+ if (old == val)
+ break;
+
+ val = old;
+ }
+
+ return true;
+}
+EXPORT_SYMBOL_GPL(refcount_dec_not_one);
+
+/*
+ * Similar to atomic_dec_and_mutex_lock(), it will WARN on underflow and fail
+ * to decrement when saturated at UINT_MAX.
+ *
+ * Provides release memory ordering, such that prior loads and stores are done
+ * before, and provides a control dependency such that free() must come after.
+ * See the comment on top.
+ */
+bool refcount_dec_and_mutex_lock(refcount_t *r, struct mutex *lock)
+{
+ if (refcount_dec_not_one(r))
+ return false;
+
+ mutex_lock(lock);
+ if (!refcount_dec_and_test(r)) {
+ mutex_unlock(lock);
+ return false;
+ }
+
+ return true;
+}
+EXPORT_SYMBOL_GPL(refcount_dec_and_mutex_lock);
+
+/*
+ * Similar to atomic_dec_and_lock(), it will WARN on underflow and fail to
+ * decrement when saturated at UINT_MAX.
+ *
+ * Provides release memory ordering, such that prior loads and stores are done
+ * before, and provides a control dependency such that free() must come after.
+ * See the comment on top.
+ */
+bool refcount_dec_and_lock(refcount_t *r, spinlock_t *lock)
+{
+ if (refcount_dec_not_one(r))
+ return false;
+
+ spin_lock(lock);
+ if (!refcount_dec_and_test(r)) {
+ spin_unlock(lock);
+ return false;
+ }
+
+ return true;
+}
+EXPORT_SYMBOL_GPL(refcount_dec_and_lock);
+
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff