projects / lttng-modules.git / blame
| Commit | Line | Data |
|---|---|---|
| 66861b2e 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 | ||
| 27 | #if defined(CONFIG_KALLSYMS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(3,19,2)) | |
| 28 | ||
| 29 | #include <linux/kallsyms.h> | |
| 30 | #include <linux/mm_types.h> | |
| 31 | #include <linux/module.h> | |
| 32 | #include "kallsyms.h" | |
| 33 | #include "page_alloc.h" | |
| 34 | ||
| 35 | static | |
| 36 | unsigned long (*get_pfnblock_flags_mask_sym)(struct page *page, | |
| 37 | unsigned long pfn, | |
| 38 | unsigned long end_bitidx, | |
| 39 | unsigned long mask); | |
| 40 | ||
| 41 | unsigned long wrapper_get_pfnblock_flags_mask(struct page *page, | |
| 42 | unsigned long pfn, | |
| 43 | unsigned long end_bitidx, | |
| 44 | unsigned long mask) | |
| 45 | { | |
| 46 | WARN_ON_ONCE(!get_pfnblock_flags_mask_sym); | |
| 47 | if (get_pfnblock_flags_mask_sym) { | |
| 48 | return get_pfnblock_flags_mask_sym(page, pfn, end_bitidx, mask); | |
| 49 | } else { | |
| 50 | return -ENOSYS; | |
| 51 | } | |
| 52 | } | |
| 53 | EXPORT_SYMBOL_GPL(wrapper_get_pfnblock_flags_mask); | |
| 54 | ||
| 55 | int wrapper_get_pfnblock_flags_mask_init(void) | |
| 56 | { | |
| 57 | get_pfnblock_flags_mask_sym = | |
| 58 | (void *) kallsyms_lookup_funcptr("get_pfnblock_flags_mask"); | |
| 59 | if (!get_pfnblock_flags_mask_sym) | |
| 60 | return -1; | |
| 61 | return 0; | |
| 62 | } | |
| 63 | ||
| 64 | #else /* #if defined(CONFIG_KALLSYMS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(3,19,2)) */ | |
| 65 | ||
| 66 | #include <linux/pageblock-flags.h> | |
| 67 | ||
| 68 | #endif /* #else #if defined(CONFIG_KALLSYMS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(3,19,2)) */ |