projects / lttng-modules.git / blame
| Commit | Line | Data |
|---|---|---|
| 9f36eaed | 1 | /* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1) |
| 389d7070 MD |
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> | |
| 389d7070 MD |
10 | */ |
| 11 | ||
| 5a2f5e92 | 12 | #include <lttng-kernel-version.h> |
| 389d7070 | 13 | |
| ffc696db | 14 | #if (defined(CONFIG_KALLSYMS) \ |
| 36561775 MD |
15 | && (LINUX_VERSION_CODE >= KERNEL_VERSION(3,19,2) \ |
| 16 | || LTTNG_KERNEL_RANGE(3,14,36, 3,15,0) \ | |
| 17 | || LTTNG_KERNEL_RANGE(3,18,10, 3,19,0) \ | |
| 397c12b4 MD |
18 | || LTTNG_DEBIAN_KERNEL_RANGE(3,16,7,9,0,0, 3,17,0,0,0,0) \ |
| 19 | || LTTNG_UBUNTU_KERNEL_RANGE(3,16,7,34, 3,17,0,0))) | |
| 389d7070 MD |
20 | |
| 21 | #include <linux/kallsyms.h> | |
| 22 | #include <linux/mm_types.h> | |
| 23 | #include <linux/module.h> | |
| 5a2f5e92 MD |
24 | #include <wrapper/kallsyms.h> |
| 25 | #include <wrapper/page_alloc.h> | |
| 389d7070 MD |
26 | |
| 27 | static | |
| 28 | unsigned long (*get_pfnblock_flags_mask_sym)(struct page *page, | |
| 29 | unsigned long pfn, | |
| 30 | unsigned long end_bitidx, | |
| 31 | unsigned long mask); | |
| 32 | ||
| 33 | unsigned long wrapper_get_pfnblock_flags_mask(struct page *page, | |
| 34 | unsigned long pfn, | |
| 35 | unsigned long end_bitidx, | |
| 36 | unsigned long mask) | |
| 37 | { | |
| 38 | WARN_ON_ONCE(!get_pfnblock_flags_mask_sym); | |
| 39 | if (get_pfnblock_flags_mask_sym) { | |
| 40 | return get_pfnblock_flags_mask_sym(page, pfn, end_bitidx, mask); | |
| 41 | } else { | |
| 42 | return -ENOSYS; | |
| 43 | } | |
| 44 | } | |
| 45 | EXPORT_SYMBOL_GPL(wrapper_get_pfnblock_flags_mask); | |
| 46 | ||
| 47 | int wrapper_get_pfnblock_flags_mask_init(void) | |
| 48 | { | |
| 49 | get_pfnblock_flags_mask_sym = | |
| 50 | (void *) kallsyms_lookup_funcptr("get_pfnblock_flags_mask"); | |
| 51 | if (!get_pfnblock_flags_mask_sym) | |
| 52 | return -1; | |
| 53 | return 0; | |
| 54 | } | |
| cd95ad24 | 55 | EXPORT_SYMBOL_GPL(wrapper_get_pfnblock_flags_mask_init); |
| 389d7070 | 56 | |
| 0e14d6e7 | 57 | #else |
| 389d7070 MD |
58 | |
| 59 | #include <linux/pageblock-flags.h> | |
| 60 | ||
| 0e14d6e7 MD |
61 | #endif |
| 62 | ||
| 63 | #if (defined(CONFIG_KALLSYMS) \ | |
| 64 | && LTTNG_UBUNTU_KERNEL_RANGE(3,13,11,50, 3,14,0,0)) | |
| 65 | ||
| 66 | #include <linux/kallsyms.h> | |
| 67 | #include <linux/mm_types.h> | |
| 68 | #include <linux/module.h> | |
| 5a2f5e92 MD |
69 | #include <wrapper/kallsyms.h> |
| 70 | #include <wrapper/page_alloc.h> | |
| 0e14d6e7 MD |
71 | |
| 72 | static | |
| 73 | unsigned long (*get_pageblock_flags_mask_sym)(struct page *page, | |
| 74 | unsigned long end_bitidx, | |
| 75 | unsigned long mask); | |
| 76 | ||
| 77 | unsigned long wrapper_get_pageblock_flags_mask(struct page *page, | |
| 78 | unsigned long end_bitidx, | |
| 79 | unsigned long mask) | |
| 80 | { | |
| 81 | WARN_ON_ONCE(!get_pageblock_flags_mask_sym); | |
| 82 | if (get_pageblock_flags_mask_sym) { | |
| 83 | return get_pageblock_flags_mask_sym(page, end_bitidx, mask); | |
| 84 | } else { | |
| 85 | return -ENOSYS; | |
| 86 | } | |
| 87 | } | |
| 88 | EXPORT_SYMBOL_GPL(wrapper_get_pageblock_flags_mask); | |
| 89 | ||
| 90 | int wrapper_get_pageblock_flags_mask_init(void) | |
| 91 | { | |
| 92 | get_pageblock_flags_mask_sym = | |
| 93 | (void *) kallsyms_lookup_funcptr("get_pageblock_flags_mask"); | |
| 94 | if (!get_pageblock_flags_mask_sym) | |
| 95 | return -1; | |
| 96 | return 0; | |
| 97 | } | |
| cd95ad24 | 98 | EXPORT_SYMBOL_GPL(wrapper_get_pfnblock_flags_mask_init); |
| 0e14d6e7 MD |
99 | |
| 100 | #else | |
| 101 | ||
| 102 | #include <linux/pageblock-flags.h> | |
| 103 | ||
| 104 | #endif |