1 /*
2 * GPL HEADER START
3 *
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
19 *
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
22 * have any questions.
23 *
24 * GPL HEADER END
25 */
26 /*
27 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
29 */
30 /*
31 * This file is part of Lustre, http://www.lustre.org/
32 * Lustre is a trademark of Sun Microsystems, Inc.
33 *
34 * libcfs/include/libcfs/libcfs_prim.h
35 *
36 * General primitives.
37 *
38 */
39
40 #ifndef __LIBCFS_PRIM_H__
41 #define __LIBCFS_PRIM_H__
42
43 void add_wait_queue_exclusive_head(wait_queue_head_t *, wait_queue_t *);
44
45 /*
46 * Memory
47 */
48 #ifndef memory_pressure_get
49 #define memory_pressure_get() (0)
50 #endif
51 #ifndef memory_pressure_set
52 #define memory_pressure_set() do {} while (0)
53 #endif
54 #ifndef memory_pressure_clr
55 #define memory_pressure_clr() do {} while (0)
56 #endif
57
cfs_memory_pressure_get_and_set(void)58 static inline int cfs_memory_pressure_get_and_set(void)
59 {
60 int old = memory_pressure_get();
61
62 if (!old)
63 memory_pressure_set();
64 return old;
65 }
66
cfs_memory_pressure_restore(int old)67 static inline void cfs_memory_pressure_restore(int old)
68 {
69 if (old)
70 memory_pressure_set();
71 else
72 memory_pressure_clr();
73 }
74 #endif
75