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67175b855b
This set of build failures just started appearing on parisc: In file included from drivers/input/serio/serio_raw.c:12: include/linux/kref.h: In function 'kref_get': include/linux/kref.h:40: error: 'TAINT_WARN' undeclared (first use in this function) include/linux/kref.h:40: error: (Each undeclared identifier is reported only once include/linux/kref.h:40: error: for each function it appears in.) include/linux/kref.h: In function 'kref_sub': include/linux/kref.h:65: error: 'TAINT_WARN' undeclared (first use in this function) It happens because TAINT_WARN is defined in kernel.h and this particular compile doesn't seem to include it (no idea why it's just manifesting .. probably some #include file untangling exposed it). Fix by adding #include <linux/kernel.h> to linux/kref.h Signed-off-by: James Bottomley <JBottomley@Parallels.com> Acked-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
96 lines
2.9 KiB
C
96 lines
2.9 KiB
C
/*
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* kref.h - library routines for handling generic reference counted objects
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*
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* Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
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* Copyright (C) 2004 IBM Corp.
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*
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* based on kobject.h which was:
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* Copyright (C) 2002-2003 Patrick Mochel <mochel@osdl.org>
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* Copyright (C) 2002-2003 Open Source Development Labs
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*
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* This file is released under the GPLv2.
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*
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*/
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#ifndef _KREF_H_
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#define _KREF_H_
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#include <linux/bug.h>
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#include <linux/atomic.h>
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#include <linux/kernel.h>
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struct kref {
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atomic_t refcount;
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};
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/**
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* kref_init - initialize object.
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* @kref: object in question.
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*/
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static inline void kref_init(struct kref *kref)
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{
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atomic_set(&kref->refcount, 1);
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}
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/**
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* kref_get - increment refcount for object.
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* @kref: object.
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*/
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static inline void kref_get(struct kref *kref)
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{
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WARN_ON(!atomic_read(&kref->refcount));
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atomic_inc(&kref->refcount);
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}
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/**
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* kref_sub - subtract a number of refcounts for object.
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* @kref: object.
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* @count: Number of recounts to subtract.
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* @release: pointer to the function that will clean up the object when the
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* last reference to the object is released.
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* This pointer is required, and it is not acceptable to pass kfree
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* in as this function. If the caller does pass kfree to this
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* function, you will be publicly mocked mercilessly by the kref
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* maintainer, and anyone else who happens to notice it. You have
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* been warned.
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*
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* Subtract @count from the refcount, and if 0, call release().
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* Return 1 if the object was removed, otherwise return 0. Beware, if this
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* function returns 0, you still can not count on the kref from remaining in
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* memory. Only use the return value if you want to see if the kref is now
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* gone, not present.
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*/
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static inline int kref_sub(struct kref *kref, unsigned int count,
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void (*release)(struct kref *kref))
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{
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WARN_ON(release == NULL);
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if (atomic_sub_and_test((int) count, &kref->refcount)) {
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release(kref);
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return 1;
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}
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return 0;
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}
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/**
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* kref_put - decrement refcount for object.
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* @kref: object.
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* @release: pointer to the function that will clean up the object when the
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* last reference to the object is released.
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* This pointer is required, and it is not acceptable to pass kfree
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* in as this function. If the caller does pass kfree to this
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* function, you will be publicly mocked mercilessly by the kref
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* maintainer, and anyone else who happens to notice it. You have
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* been warned.
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*
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* Decrement the refcount, and if 0, call release().
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* Return 1 if the object was removed, otherwise return 0. Beware, if this
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* function returns 0, you still can not count on the kref from remaining in
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* memory. Only use the return value if you want to see if the kref is now
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* gone, not present.
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*/
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static inline int kref_put(struct kref *kref, void (*release)(struct kref *kref))
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{
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return kref_sub(kref, 1, release);
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}
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#endif /* _KREF_H_ */
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