projects / lttng-modules.git / blame
| Commit | Line | Data |
|---|---|---|
| 389d7070 MD |
1 | /* |
| 2 | * wrapper/page_alloc.c | |
| 3 | * | |
| 0e14d6e7 MD |
4 | * wrapper around get_pfnblock_flags_mask and Ubuntu |
| 5 | * get_pageblock_flags_mask. Using KALLSYMS to get their address when | |
| 6 | * available, else we need to have a kernel that exports this function | |
| 7 | * to GPL modules. | |
| 389d7070 MD |
8 | * |
| 9 | * Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
| 10 | * | |
| 11 | * This library is free software; you can redistribute it and/or | |
| 12 | * modify it under the terms of the GNU Lesser General Public | |
| 13 | * License as published by the Free Software Foundation; only | |
| 14 | * version 2.1 of the License. | |
| 15 | * | |
| 16 | * This library is distributed in the hope that it will be useful, | |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 19 | * Lesser General Public License for more details. | |
| 20 | * | |
| 21 | * You should have received a copy of the GNU Lesser General Public | |
| 22 | * License along with this library; if not, write to the Free Software | |
| 23 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| 24 | */ | |
| 25 | ||
| 5a2f5e92 | 26 | #include <lttng-kernel-version.h> |
| 389d7070 | 27 | |
| ffc696db | 28 | #if (defined(CONFIG_KALLSYMS) \ |
| 36561775 MD |
29 | && (LINUX_VERSION_CODE >= KERNEL_VERSION(3,19,2) \ |
| 30 | || LTTNG_KERNEL_RANGE(3,14,36, 3,15,0) \ | |
| 31 | || LTTNG_KERNEL_RANGE(3,18,10, 3,19,0) \ | |
| 397c12b4 MD |
32 | || LTTNG_DEBIAN_KERNEL_RANGE(3,16,7,9,0,0, 3,17,0,0,0,0) \ |
| 33 | || LTTNG_UBUNTU_KERNEL_RANGE(3,16,7,34, 3,17,0,0))) | |
| 389d7070 MD |
34 | |
| 35 | #include <linux/kallsyms.h> | |
| 36 | #include <linux/mm_types.h> | |
| 37 | #include <linux/module.h> | |
| 5a2f5e92 MD |
38 | #include <wrapper/kallsyms.h> |
| 39 | #include <wrapper/page_alloc.h> | |
| 389d7070 MD |
40 | |
| 41 | static | |
| 42 | unsigned long (*get_pfnblock_flags_mask_sym)(struct page *page, | |
| 43 | unsigned long pfn, | |
| 44 | unsigned long end_bitidx, | |
| 45 | unsigned long mask); | |
| 46 | ||
| 47 | unsigned long wrapper_get_pfnblock_flags_mask(struct page *page, | |
| 48 | unsigned long pfn, | |
| 49 | unsigned long end_bitidx, | |
| 50 | unsigned long mask) | |
| 51 | { | |
| 52 | WARN_ON_ONCE(!get_pfnblock_flags_mask_sym); | |
| 53 | if (get_pfnblock_flags_mask_sym) { | |
| 54 | return get_pfnblock_flags_mask_sym(page, pfn, end_bitidx, mask); | |
| 55 | } else { | |
| 56 | return -ENOSYS; | |
| 57 | } | |
| 58 | } | |
| 59 | EXPORT_SYMBOL_GPL(wrapper_get_pfnblock_flags_mask); | |
| 60 | ||
| 61 | int wrapper_get_pfnblock_flags_mask_init(void) | |
| 62 | { | |
| 63 | get_pfnblock_flags_mask_sym = | |
| 64 | (void *) kallsyms_lookup_funcptr("get_pfnblock_flags_mask"); | |
| 65 | if (!get_pfnblock_flags_mask_sym) | |
| 66 | return -1; | |
| 67 | return 0; | |
| 68 | } | |
| 69 | ||
| 0e14d6e7 | 70 | #else |
| 389d7070 MD |
71 | |
| 72 | #include <linux/pageblock-flags.h> | |
| 73 | ||
| 0e14d6e7 MD |
74 | #endif |
| 75 | ||
| 76 | #if (defined(CONFIG_KALLSYMS) \ | |
| 77 | && LTTNG_UBUNTU_KERNEL_RANGE(3,13,11,50, 3,14,0,0)) | |
| 78 | ||
| 79 | #include <linux/kallsyms.h> | |
| 80 | #include <linux/mm_types.h> | |
| 81 | #include <linux/module.h> | |
| 5a2f5e92 MD |
82 | #include <wrapper/kallsyms.h> |
| 83 | #include <wrapper/page_alloc.h> | |
| 0e14d6e7 MD |
84 | |
| 85 | static | |
| 86 | unsigned long (*get_pageblock_flags_mask_sym)(struct page *page, | |
| 87 | unsigned long end_bitidx, | |
| 88 | unsigned long mask); | |
| 89 | ||
| 90 | unsigned long wrapper_get_pageblock_flags_mask(struct page *page, | |
| 91 | unsigned long end_bitidx, | |
| 92 | unsigned long mask) | |
| 93 | { | |
| 94 | WARN_ON_ONCE(!get_pageblock_flags_mask_sym); | |
| 95 | if (get_pageblock_flags_mask_sym) { | |
| 96 | return get_pageblock_flags_mask_sym(page, end_bitidx, mask); | |
| 97 | } else { | |
| 98 | return -ENOSYS; | |
| 99 | } | |
| 100 | } | |
| 101 | EXPORT_SYMBOL_GPL(wrapper_get_pageblock_flags_mask); | |
| 102 | ||
| 103 | int wrapper_get_pageblock_flags_mask_init(void) | |
| 104 | { | |
| 105 | get_pageblock_flags_mask_sym = | |
| 106 | (void *) kallsyms_lookup_funcptr("get_pageblock_flags_mask"); | |
| 107 | if (!get_pageblock_flags_mask_sym) | |
| 108 | return -1; | |
| 109 | return 0; | |
| 110 | } | |
| 111 | ||
| 112 | #else | |
| 113 | ||
| 114 | #include <linux/pageblock-flags.h> | |
| 115 | ||
| 116 | #endif |