https://github.com/torvalds/linux
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- v5.5
- v5.4-rc8
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- v5.2
- v5.19-rc8
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- v5.19-rc1
- v5.19
- v5.18-rc7
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- v5.18
- v5.17-rc8
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- v5.17-rc1
- v5.17
- v5.16-rc8
- v5.16-rc7
- v5.16-rc6
- v5.16-rc5
- v5.16-rc4
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- v5.16-rc1
- v5.16
- v5.15-rc7
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- v5.15-rc5
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- v5.15-rc1
- v5.15
- v5.14-rc7
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- v5.14-rc5
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- v5.14-rc2
- v5.14-rc1
- v5.14
- v5.13-rc7
- v5.13-rc6
- v5.13-rc5
- v5.13-rc4
- v5.13-rc3
- v5.13-rc2
- v5.13-rc1
- v5.13
- v5.12-rc8
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- v5.12-rc5
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- v5.12-rc3
- v5.12-rc2
- v5.12-rc1
- v5.12
- v5.11-rc7
- v5.11-rc6
- v5.11-rc5
- v5.11-rc4
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- v5.11-rc2
- v5.11-rc1
- v5.11
- v5.10-rc7
- v5.10-rc6
- v5.10-rc5
- v5.10-rc4
- v5.10-rc3
- v5.10-rc2
- v5.10-rc1
- v5.10
- v5.1-rc7
- v5.1-rc6
- v5.1-rc5
- v5.1-rc4
- v5.1-rc3
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- v5.1
- v5.0-rc8
- v5.0-rc7
- v5.0-rc6
- v5.0-rc5
- v5.0-rc4
- v5.0-rc3
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- v5.0
- v4.9-rc8
- v4.9-rc7
- v4.9-rc6
- v4.9-rc5
- v4.9-rc4
- v4.9-rc3
- v4.9-rc2
- v4.9-rc1
- v4.9
- v4.8-rc8
- v4.8-rc7
- v4.8-rc6
- v4.8-rc5
- v4.8-rc4
- v4.8-rc3
- v4.8-rc2
- v4.8-rc1
- v4.8
- v4.7-rc7
- v4.7-rc6
- v4.7-rc5
- v4.7-rc4
- v4.7-rc3
- v4.7-rc2
- v4.7-rc1
- v4.7
- v4.6-rc7
- v4.6-rc6
- v4.6-rc5
- v4.6-rc4
- v4.6-rc3
- v4.6-rc2
- v4.6-rc1
- v4.6
- v4.5-rc7
- v4.5-rc6
- v4.5-rc5
- v4.5-rc4
- v4.5-rc3
- v4.5-rc2
- v4.5-rc1
- v4.5
- v4.4-rc8
- v4.4-rc7
- v4.4-rc6
- v4.4-rc5
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- v4.4-rc3
- v4.4-rc2
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- v4.4
- v4.3-rc7
- v4.3-rc6
- v4.3-rc5
- v4.3-rc4
- v4.3-rc3
- v4.3-rc2
- v4.3-rc1
- v4.3
- v4.20-rc7
- v4.20-rc6
- v4.20-rc5
- v4.20-rc4
- v4.20-rc3
- v4.20-rc2
- v4.20-rc1
- v4.20
- v4.2-rc8
- v4.2-rc7
- v4.2-rc6
- v4.2-rc5
- v4.2-rc4
- v4.2-rc3
- v4.2-rc2
- v4.2-rc1
- v4.2
- v4.19-rc8
- v4.19-rc7
- v4.19-rc6
- v4.19-rc5
- v4.19-rc4
- v4.19-rc3
- v4.19-rc2
- v4.19-rc1
- v4.19
- v4.18-rc8
- v4.18-rc7
- v4.18-rc6
- v4.18-rc5
- v4.18-rc4
- v4.18-rc3
- v4.18-rc2
- v4.18-rc1
- v4.18
- v4.17-rc7
- v4.17-rc6
- v4.17-rc5
- v4.17-rc4
- v4.17-rc3
- v4.17-rc2
- v4.17-rc1
- v4.17
- v4.16-rc7
- v4.16-rc6
- v4.16-rc5
- v4.16-rc4
- v4.16-rc3
- v4.16-rc2
- v4.16-rc1
- v4.16
- v4.15-rc9
- v4.15-rc8
- v4.15-rc7
- v4.15-rc6
- v4.15-rc5
- v4.15-rc4
- v4.15-rc3
- v4.15-rc2
- v4.15-rc1
- v4.15
- v4.14-rc8
- v4.14-rc7
- v4.14-rc6
- v4.14-rc5
- v4.14-rc4
- v4.14-rc3
- v4.14-rc2
- v4.14-rc1
- v4.14
- v4.13-rc7
- v4.13-rc6
- v4.13-rc5
- v4.13-rc4
- v4.13-rc3
- v4.13-rc2
- v4.13-rc1
- v4.13
- v4.12-rc7
- v4.12-rc6
- v4.12-rc5
- v4.12-rc4
- v4.12-rc3
- v4.12-rc2
- v4.12-rc1
- v4.12
- v4.11-rc8
- v4.11-rc7
- v4.11-rc6
- v4.11-rc5
- v4.11-rc4
- v4.11-rc3
- v4.11-rc2
- v4.11-rc1
- v4.11
- v4.10-rc8
- v4.10-rc7
- v4.10-rc6
- v4.10-rc5
- v4.10-rc4
- v4.10-rc3
- v4.10-rc2
- v4.10-rc1
- v4.10
- v4.1-rc8
- v4.1-rc7
- v4.1-rc6
- v4.1-rc5
- v4.1-rc4
- v4.1-rc3
- v4.1-rc2
- v4.1-rc1
- v4.1
- v4.0-rc7
- v4.0-rc6
- v4.0-rc5
- v4.0-rc4
- v4.0-rc3
- v4.0-rc2
- v4.0-rc1
- v4.0
- v3.9-rc8
- v3.9-rc7
- v3.9-rc6
- v3.9-rc5
- v3.9-rc4
- v3.9-rc3
- v3.9-rc2
- v3.9-rc1
- v3.9
- v3.8-rc7
- v3.8-rc6
- v3.8-rc5
- v3.8-rc4
- v3.8-rc3
- v3.8-rc2
- v3.8-rc1
- v3.8
- v3.7-rc8
- v3.7-rc7
- v3.7-rc6
- v3.7-rc5
- v3.7-rc4
- v3.7-rc3
- v3.7-rc2
- v3.7-rc1
- v3.7
- v3.6-rc7
- v3.6-rc6
- v3.6-rc5
- v3.6-rc4
- v3.6-rc3
- v3.6-rc2
- v3.6-rc1
- v3.6
- v3.5-rc7
- v3.5-rc6
- v3.5-rc5
- v3.5-rc4
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- v3.5-rc1
- v3.5
- v3.4-rc7
- v3.4-rc6
- v3.4-rc5
- v3.4-rc4
- v3.4-rc3
- v3.4-rc2
- v3.4-rc1
- v3.4
- v3.3-rc7
- v3.3-rc6
- v3.3-rc5
- v3.3-rc4
- v3.3-rc3
- v3.3-rc2
- v3.3-rc1
- v3.3
- v3.2-rc7
- v3.2-rc6
- v3.2-rc5
- v3.2-rc4
- v3.2-rc3
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- v3.2-rc1
- v3.2
- v3.19-rc7
- v3.19-rc6
- v3.19-rc5
- v3.19-rc4
- v3.19-rc3
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- v3.19-rc1
- v3.19
- v3.18-rc7
- v3.18-rc6
- v3.18-rc5
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- v3.18
- v3.17-rc7
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- v3.17-rc5
- v3.17-rc4
- v3.17-rc3
- v3.17-rc2
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- v3.17
- v3.16-rc7
- v3.16-rc6
- v3.16-rc5
- v3.16-rc4
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- v3.16-rc1
- v3.16
- v3.15-rc8
- v3.15-rc7
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- v3.15-rc5
- v3.15-rc4
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- v3.15-rc2
- v3.15-rc1
- v3.15
- v3.14-rc8
- v3.14-rc7
- v3.14-rc6
- v3.14-rc5
- v3.14-rc4
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- v3.14
- v3.13-rc8
- v3.13-rc7
- v3.13-rc6
- v3.13-rc5
- v3.13-rc4
- v3.13-rc3
- v3.13-rc2
- v3.13-rc1
- v3.13
- v3.12-rc7
- v3.12-rc6
- v3.12-rc5
- v3.12-rc4
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- v3.12-rc2
- v3.12-rc1
- v3.12
- v3.11-rc7
- v3.11-rc6
- v3.11-rc5
- v3.11-rc4
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- v3.11-rc1
- v3.11
- v3.10-rc7
- v3.10-rc6
- v3.10-rc5
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- v3.10-rc3
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- v3.10
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- v3.0-rc7
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- v2.6.39-rc7
- v2.6.39-rc6
- v2.6.39-rc5
- v2.6.39-rc4
- v2.6.39-rc3
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- v2.6.39
- v2.6.38-rc8
- v2.6.38-rc7
- v2.6.38-rc6
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- v2.6.38-rc4
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- v2.6.38
- v2.6.37-rc8
- v2.6.37-rc7
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- v2.6.37
- v2.6.36-rc8
- v2.6.36-rc7
- v2.6.36-rc6
- v2.6.36-rc5
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- v2.6.36
- v2.6.35-rc6
- v2.6.35-rc5
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- v2.6.34-rc7
- v2.6.34-rc6
- v2.6.34-rc5
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- v2.6.33-rc8
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- v2.6.31-rc9
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- v2.6.16
- v2.6.15-rc7
- v2.6.15-rc6
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Tip revision: 3bedff1d73b86e0cf52634efb447e9ada08f2cc6 authored by Linus Torvalds on 20 November 2005, 03:25:03 UTC
Linux v2.6.15-rc2
Linux v2.6.15-rc2
Tip revision: 3bedff1
kref.c
/*
* kref.c - library routines for handling generic reference counted objects
*
* Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
* Copyright (C) 2004 IBM Corp.
*
* based on lib/kobject.c which was:
* Copyright (C) 2002-2003 Patrick Mochel <mochel@osdl.org>
*
* This file is released under the GPLv2.
*
*/
#include <linux/kref.h>
#include <linux/module.h>
/**
* kref_init - initialize object.
* @kref: object in question.
*/
void kref_init(struct kref *kref)
{
atomic_set(&kref->refcount,1);
}
/**
* kref_get - increment refcount for object.
* @kref: object.
*/
void kref_get(struct kref *kref)
{
WARN_ON(!atomic_read(&kref->refcount));
atomic_inc(&kref->refcount);
}
/**
* kref_put - decrement refcount for object.
* @kref: object.
* @release: pointer to the function that will clean up the object when the
* last reference to the object is released.
* This pointer is required, and it is not acceptable to pass kfree
* in as this function.
*
* Decrement the refcount, and if 0, call release().
* Return 1 if the object was removed, otherwise return 0. Beware, if this
* function returns 0, you still can not count on the kref from remaining in
* memory. Only use the return value if you want to see if the kref is now
* gone, not present.
*/
int kref_put(struct kref *kref, void (*release)(struct kref *kref))
{
WARN_ON(release == NULL);
WARN_ON(release == (void (*)(struct kref *))kfree);
if (atomic_dec_and_test(&kref->refcount)) {
release(kref);
return 1;
}
return 0;
}
EXPORT_SYMBOL(kref_init);
EXPORT_SYMBOL(kref_get);
EXPORT_SYMBOL(kref_put);