| 1 | /* |
| 2 | * wrapper/page_alloc.c |
| 3 | * |
| 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. |
| 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) \ |
| 29 | && (LINUX_VERSION_CODE >= KERNEL_VERSION(3,19,2) \ |
| 30 | || LTTNG_DEBIAN_KERNEL_RANGE(3,16,7,9,0,0, 3,17,0,0,0,0))) |
| 31 | |
| 32 | #include <linux/kallsyms.h> |
| 33 | #include <linux/mm_types.h> |
| 34 | #include <linux/module.h> |
| 35 | #include "kallsyms.h" |
| 36 | #include "page_alloc.h" |
| 37 | |
| 38 | static |
| 39 | unsigned long (*get_pfnblock_flags_mask_sym)(struct page *page, |
| 40 | unsigned long pfn, |
| 41 | unsigned long end_bitidx, |
| 42 | unsigned long mask); |
| 43 | |
| 44 | unsigned long wrapper_get_pfnblock_flags_mask(struct page *page, |
| 45 | unsigned long pfn, |
| 46 | unsigned long end_bitidx, |
| 47 | unsigned long mask) |
| 48 | { |
| 49 | WARN_ON_ONCE(!get_pfnblock_flags_mask_sym); |
| 50 | if (get_pfnblock_flags_mask_sym) { |
| 51 | return get_pfnblock_flags_mask_sym(page, pfn, end_bitidx, mask); |
| 52 | } else { |
| 53 | return -ENOSYS; |
| 54 | } |
| 55 | } |
| 56 | EXPORT_SYMBOL_GPL(wrapper_get_pfnblock_flags_mask); |
| 57 | |
| 58 | int wrapper_get_pfnblock_flags_mask_init(void) |
| 59 | { |
| 60 | get_pfnblock_flags_mask_sym = |
| 61 | (void *) kallsyms_lookup_funcptr("get_pfnblock_flags_mask"); |
| 62 | if (!get_pfnblock_flags_mask_sym) |
| 63 | return -1; |
| 64 | return 0; |
| 65 | } |
| 66 | |
| 67 | #else |
| 68 | |
| 69 | #include <linux/pageblock-flags.h> |
| 70 | |
| 71 | #endif |
| 72 | |
| 73 | #if (defined(CONFIG_KALLSYMS) \ |
| 74 | && LTTNG_UBUNTU_KERNEL_RANGE(3,13,11,50, 3,14,0,0)) |
| 75 | |
| 76 | #include <linux/kallsyms.h> |
| 77 | #include <linux/mm_types.h> |
| 78 | #include <linux/module.h> |
| 79 | #include "kallsyms.h" |
| 80 | #include "page_alloc.h" |
| 81 | |
| 82 | static |
| 83 | unsigned long (*get_pageblock_flags_mask_sym)(struct page *page, |
| 84 | unsigned long end_bitidx, |
| 85 | unsigned long mask); |
| 86 | |
| 87 | unsigned long wrapper_get_pageblock_flags_mask(struct page *page, |
| 88 | unsigned long end_bitidx, |
| 89 | unsigned long mask) |
| 90 | { |
| 91 | WARN_ON_ONCE(!get_pageblock_flags_mask_sym); |
| 92 | if (get_pageblock_flags_mask_sym) { |
| 93 | return get_pageblock_flags_mask_sym(page, end_bitidx, mask); |
| 94 | } else { |
| 95 | return -ENOSYS; |
| 96 | } |
| 97 | } |
| 98 | EXPORT_SYMBOL_GPL(wrapper_get_pageblock_flags_mask); |
| 99 | |
| 100 | int wrapper_get_pageblock_flags_mask_init(void) |
| 101 | { |
| 102 | get_pageblock_flags_mask_sym = |
| 103 | (void *) kallsyms_lookup_funcptr("get_pageblock_flags_mask"); |
| 104 | if (!get_pageblock_flags_mask_sym) |
| 105 | return -1; |
| 106 | return 0; |
| 107 | } |
| 108 | |
| 109 | #else |
| 110 | |
| 111 | #include <linux/pageblock-flags.h> |
| 112 | |
| 113 | #endif |