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9c1f4643 MD |
1 | #ifndef _LTTNG_WRAPPER_KREF_H |
2 | #define _LTTNG_WRAPPER_KREF_H | |
3 | ||
4 | /* | |
5 | * wrapper/kref.h | |
6 | * | |
7 | * wrapper around linux/kref.h. | |
8 | * | |
9 | * Copyright (C) 2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; only version 2 of the License. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License along | |
21 | * with this program; if not, write to the Free Software Foundation, Inc., | |
22 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
23 | * | |
24 | * This wrapper code is derived from Linux 3.19.2 include/linux/list.h | |
25 | * and include/linux/rculist.h, hence the GPLv2 license applied to this | |
26 | * file. | |
27 | */ | |
28 | ||
29 | #include <linux/kref.h> | |
30 | #include <linux/rculist.h> | |
77932315 | 31 | #include <linux/version.h> |
9c1f4643 MD |
32 | |
33 | /* | |
34 | * lttng_kref_get: get reference count, checking for overflow. | |
35 | * | |
36 | * Return 1 if reference is taken, 0 otherwise (overflow). | |
37 | */ | |
77932315 FD |
38 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,11,0)) |
39 | static inline int lttng_kref_get(struct kref *kref) | |
40 | { | |
41 | kref_get(kref); | |
42 | return 1; | |
43 | } | |
44 | #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,11,0)) */ | |
9c1f4643 MD |
45 | static inline int lttng_kref_get(struct kref *kref) |
46 | { | |
4c4d77da | 47 | return atomic_add_unless(&kref->refcount, 1, INT_MAX); |
9c1f4643 | 48 | } |
77932315 | 49 | #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,11,0)) */ |
9c1f4643 MD |
50 | |
51 | #endif /* _LTTNG_WRAPPER_KREF_H */ |