mirror of https://github.com/OpenIPC/firmware.git
107 lines
2.9 KiB
Diff
107 lines
2.9 KiB
Diff
diff -drupN a/include/linux/refcount.h b/include/linux/refcount.h
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--- a/include/linux/refcount.h 1970-01-01 03:00:00.000000000 +0300
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+++ b/include/linux/refcount.h 2022-06-12 05:28:14.000000000 +0300
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@@ -0,0 +1,102 @@
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+/* SPDX-License-Identifier: GPL-2.0 */
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+#ifndef _LINUX_REFCOUNT_H
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+#define _LINUX_REFCOUNT_H
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+
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+#include <linux/atomic.h>
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+#include <linux/mutex.h>
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+#include <linux/spinlock.h>
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+#include <linux/kernel.h>
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+
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+/**
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+ * struct refcount_t - variant of atomic_t specialized for reference counts
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+ * @refs: atomic_t counter field
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+ *
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+ * The counter saturates at UINT_MAX and will not move once
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+ * there. This avoids wrapping the counter and causing 'spurious'
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+ * use-after-free bugs.
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+ */
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+typedef struct refcount_struct {
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+ atomic_t refs;
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+} refcount_t;
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+
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+#define REFCOUNT_INIT(n) { .refs = ATOMIC_INIT(n), }
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+
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+/**
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+ * refcount_set - set a refcount's value
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+ * @r: the refcount
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+ * @n: value to which the refcount will be set
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+ */
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+static inline void refcount_set(refcount_t *r, unsigned int n)
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+{
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+ atomic_set(&r->refs, n);
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+}
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+
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+/**
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+ * refcount_read - get a refcount's value
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+ * @r: the refcount
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+ *
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+ * Return: the refcount's value
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+ */
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+static inline unsigned int refcount_read(const refcount_t *r)
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+{
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+ return atomic_read(&r->refs);
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+}
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+
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+#ifdef CONFIG_REFCOUNT_FULL
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+extern __must_check bool refcount_add_not_zero(unsigned int i, refcount_t *r);
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+extern void refcount_add(unsigned int i, refcount_t *r);
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+
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+extern __must_check bool refcount_inc_not_zero(refcount_t *r);
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+extern void refcount_inc(refcount_t *r);
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+
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+extern __must_check bool refcount_sub_and_test(unsigned int i, refcount_t *r);
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+
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+extern __must_check bool refcount_dec_and_test(refcount_t *r);
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+extern void refcount_dec(refcount_t *r);
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+#else
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+# ifdef CONFIG_ARCH_HAS_REFCOUNT
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+# include <asm/refcount.h>
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+# else
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+static inline __must_check bool refcount_add_not_zero(unsigned int i, refcount_t *r)
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+{
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+ return atomic_add_unless(&r->refs, i, 0);
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+}
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+
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+static inline void refcount_add(unsigned int i, refcount_t *r)
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+{
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+ atomic_add(i, &r->refs);
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+}
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+
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+static inline __must_check bool refcount_inc_not_zero(refcount_t *r)
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+{
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+ return atomic_add_unless(&r->refs, 1, 0);
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+}
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+
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+static inline void refcount_inc(refcount_t *r)
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+{
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+ atomic_inc(&r->refs);
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+}
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+
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+static inline __must_check bool refcount_sub_and_test(unsigned int i, refcount_t *r)
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+{
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+ return atomic_sub_and_test(i, &r->refs);
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+}
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+
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+static inline __must_check bool refcount_dec_and_test(refcount_t *r)
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+{
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+ return atomic_dec_and_test(&r->refs);
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+}
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+
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+static inline void refcount_dec(refcount_t *r)
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+{
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+ atomic_dec(&r->refs);
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+}
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+# endif /* !CONFIG_ARCH_HAS_REFCOUNT */
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+#endif /* CONFIG_REFCOUNT_FULL */
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+
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+extern __must_check bool refcount_dec_if_one(refcount_t *r);
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+extern __must_check bool refcount_dec_not_one(refcount_t *r);
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+extern __must_check bool refcount_dec_and_mutex_lock(refcount_t *r, struct mutex *lock);
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+extern __must_check bool refcount_dec_and_lock(refcount_t *r, spinlock_t *lock);
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+
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+#endif /* _LINUX_REFCOUNT_H */
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