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389d7070 MD |
1 | /* |
2 | * wrapper/page_alloc.c | |
3 | * | |
4 | * wrapper around get_pfnblock_flags_mask. Using KALLSYMS to get its address | |
5 | * when available, else we need to have a kernel that exports this function to | |
6 | * GPL modules. | |
7 | * | |
8 | * Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
9 | * | |
10 | * This library is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU Lesser General Public | |
12 | * License as published by the Free Software Foundation; only | |
13 | * version 2.1 of the License. | |
14 | * | |
15 | * This library 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 GNU | |
18 | * Lesser General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU Lesser General Public | |
21 | * License along with this library; if not, write to the Free Software | |
22 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
23 | */ | |
24 | ||
25 | #include "../lttng-kernel-version.h" | |
26 | ||
ffc696db MD |
27 | #if (defined(CONFIG_KALLSYMS) \ |
28 | && (LINUX_VERSION_CODE >= KERNEL_VERSION(3,19,2) \ | |
29 | || LTTNG_DEBIAN_KERNEL_RANGE(3,16,7,9,0,0, 3,17,0,0,0,0))) | |
389d7070 MD |
30 | |
31 | #include <linux/kallsyms.h> | |
32 | #include <linux/mm_types.h> | |
33 | #include <linux/module.h> | |
34 | #include "kallsyms.h" | |
35 | #include "page_alloc.h" | |
36 | ||
37 | static | |
38 | unsigned long (*get_pfnblock_flags_mask_sym)(struct page *page, | |
39 | unsigned long pfn, | |
40 | unsigned long end_bitidx, | |
41 | unsigned long mask); | |
42 | ||
43 | unsigned long wrapper_get_pfnblock_flags_mask(struct page *page, | |
44 | unsigned long pfn, | |
45 | unsigned long end_bitidx, | |
46 | unsigned long mask) | |
47 | { | |
48 | WARN_ON_ONCE(!get_pfnblock_flags_mask_sym); | |
49 | if (get_pfnblock_flags_mask_sym) { | |
50 | return get_pfnblock_flags_mask_sym(page, pfn, end_bitidx, mask); | |
51 | } else { | |
52 | return -ENOSYS; | |
53 | } | |
54 | } | |
55 | EXPORT_SYMBOL_GPL(wrapper_get_pfnblock_flags_mask); | |
56 | ||
57 | int wrapper_get_pfnblock_flags_mask_init(void) | |
58 | { | |
59 | get_pfnblock_flags_mask_sym = | |
60 | (void *) kallsyms_lookup_funcptr("get_pfnblock_flags_mask"); | |
61 | if (!get_pfnblock_flags_mask_sym) | |
62 | return -1; | |
63 | return 0; | |
64 | } | |
65 | ||
66 | #else /* #if defined(CONFIG_KALLSYMS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(3,19,2)) */ | |
67 | ||
68 | #include <linux/pageblock-flags.h> | |
69 | ||
70 | #endif /* #else #if defined(CONFIG_KALLSYMS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(3,19,2)) */ |