From aa75cb08448aab4940cb61defbf635ab3a56eb77 Mon Sep 17 00:00:00 2001 From: Frank Mori Hess Date: Mon, 21 Nov 2005 01:15:31 +0000 Subject: [PATCH] Added compatibility wrapper for kref.h --- include/linux/kref.h | 108 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 108 insertions(+) create mode 100644 include/linux/kref.h diff --git a/include/linux/kref.h b/include/linux/kref.h new file mode 100644 index 00000000..f7a51121 --- /dev/null +++ b/include/linux/kref.h @@ -0,0 +1,108 @@ +/* + +Copyright (C) 2005 Frank Mori Hess +2.4 compat code is based on kernel's lib/kref.c which was: +Copyright (C) 2004 Greg Kroah-Hartman +Copyright (C) 2004 IBM Corp. +Copyright (C) 2002-2003 Patrick Mochel + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +#ifndef _KREF_COMPAT_H_ +#define _KREF_COMPAT_H_ + +#include + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) + +#include +#include + +struct kref { + atomic_t refcount; +}; + +static inline void kref_init(struct kref *kref) +{ + atomic_set(&kref->refcount,1); +} + +static inline void kref_get(struct kref *kref) +{ + atomic_inc(&kref->refcount); +} + +static inline int kref_put(struct kref *kref, void (*release) (struct kref *kref)) +{ + if (atomic_dec_and_test(&kref->refcount)) { + release(kref); + return 1; + } + return 0; +} + +static inline void KREF_INIT(struct kref *kref, void (*release) (struct kref *kref)) +{ + kref_init(kref); +} + +static inline int KREF_PUT(struct kref *kref, void (*release) (struct kref *kref)) +{ + return kref_put(kref, release); +} + +#else + +#include_next + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,9) + +static inline void KREF_INIT(struct kref *kref, void (*release) (struct kref *kref)) +{ + kref_init(kref, release); +} + +static inline int KREF_PUT(struct kref *kref, void (*release) (struct kref *kref)) +{ + int retval; + if(atomic_read(&kref->refcount) == 1) + { + retval = 1; + }else + { + retval = 0; + } + kref_put(kref); + return retval; +} + +#else + +static inline void KREF_INIT(struct kref *kref, void (*release) (struct kref *kref)) +{ + kref_init(kref); +} + +static inline int KREF_PUT(struct kref *kref, void (*release) (struct kref *kref)) +{ + return kref_put(kref, release); +} + +#endif // LINUX_VERSION_CODE < KERNEL_VERSION(2,6,9) + +#endif // LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) + +#endif /* _KREF_COMPAT_H_ */ -- 2.26.2