projects / lttng-modules.git / blame
| Commit | Line | Data |
|---|---|---|
| 66861b2e MD |
1 | /* |
| 2 | * wrapper/page_alloc.c | |
| 3 | * | |
| 7d5f6cef 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. | |
| 66861b2e 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 | ||
| 26 | #include "../lttng-kernel-version.h" | |
| 27 | ||
| 28 | #if defined(CONFIG_KALLSYMS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(3,19,2)) | |
| 29 | ||
| 30 | #include <linux/kallsyms.h> | |
| 31 | #include <linux/mm_types.h> | |
| 32 | #include <linux/module.h> | |
| 33 | #include "kallsyms.h" | |
| 34 | #include "page_alloc.h" | |
| 35 | ||
| 36 | static | |
| 37 | unsigned long (*get_pfnblock_flags_mask_sym)(struct page *page, | |
| 38 | unsigned long pfn, | |
| 39 | unsigned long end_bitidx, | |
| 40 | unsigned long mask); | |
| 41 | ||
| 42 | unsigned long wrapper_get_pfnblock_flags_mask(struct page *page, | |
| 43 | unsigned long pfn, | |
| 44 | unsigned long end_bitidx, | |
| 45 | unsigned long mask) | |
| 46 | { | |
| 47 | WARN_ON_ONCE(!get_pfnblock_flags_mask_sym); | |
| 48 | if (get_pfnblock_flags_mask_sym) { | |
| 49 | return get_pfnblock_flags_mask_sym(page, pfn, end_bitidx, mask); | |
| 50 | } else { | |
| 51 | return -ENOSYS; | |
| 52 | } | |
| 53 | } | |
| 54 | EXPORT_SYMBOL_GPL(wrapper_get_pfnblock_flags_mask); | |
| 55 | ||
| 56 | int wrapper_get_pfnblock_flags_mask_init(void) | |
| 57 | { | |
| 58 | get_pfnblock_flags_mask_sym = | |
| 59 | (void *) kallsyms_lookup_funcptr("get_pfnblock_flags_mask"); | |
| 60 | if (!get_pfnblock_flags_mask_sym) | |
| 61 | return -1; | |
| 62 | return 0; | |
| 63 | } | |
| 64 | ||
| 7d5f6cef | 65 | #else |
| 66861b2e MD |
66 | |
| 67 | #include <linux/pageblock-flags.h> | |
| 68 | ||
| 7d5f6cef MD |
69 | #endif |
| 70 | ||
| 71 | #if (defined(CONFIG_KALLSYMS) \ | |
| 72 | && LTTNG_UBUNTU_KERNEL_RANGE(3,13,11,50, 3,14,0,0)) | |
| 73 | ||
| 74 | #include <linux/kallsyms.h> | |
| 75 | #include <linux/mm_types.h> | |
| 76 | #include <linux/module.h> | |
| 77 | #include "kallsyms.h" | |
| 78 | #include "page_alloc.h" | |
| 79 | ||
| 80 | static | |
| 81 | unsigned long (*get_pageblock_flags_mask_sym)(struct page *page, | |
| 82 | unsigned long end_bitidx, | |
| 83 | unsigned long mask); | |
| 84 | ||
| 85 | unsigned long wrapper_get_pageblock_flags_mask(struct page *page, | |
| 86 | unsigned long end_bitidx, | |
| 87 | unsigned long mask) | |
| 88 | { | |
| 89 | WARN_ON_ONCE(!get_pageblock_flags_mask_sym); | |
| 90 | if (get_pageblock_flags_mask_sym) { | |
| 91 | return get_pageblock_flags_mask_sym(page, end_bitidx, mask); | |
| 92 | } else { | |
| 93 | return -ENOSYS; | |
| 94 | } | |
| 95 | } | |
| 96 | EXPORT_SYMBOL_GPL(wrapper_get_pageblock_flags_mask); | |
| 97 | ||
| 98 | int wrapper_get_pageblock_flags_mask_init(void) | |
| 99 | { | |
| 100 | get_pageblock_flags_mask_sym = | |
| 101 | (void *) kallsyms_lookup_funcptr("get_pageblock_flags_mask"); | |
| 102 | if (!get_pageblock_flags_mask_sym) | |
| 103 | return -1; | |
| 104 | return 0; | |
| 105 | } | |
| 106 | ||
| 107 | #else | |
| 108 | ||
| 109 | #include <linux/pageblock-flags.h> | |
| 110 | ||
| 111 | #endif |