1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
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
9 * Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
12 #include <lttng/kernel-version.h>
14 #if (defined(CONFIG_KALLSYMS) \
15 && (LTTNG_LINUX_VERSION_CODE >= LTTNG_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) \
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)))
21 #include <linux/kallsyms.h>
22 #include <linux/mm_types.h>
23 #include <linux/module.h>
24 #include <wrapper/kallsyms.h>
25 #include <wrapper/page_alloc.h>
28 unsigned long (*get_pfnblock_flags_mask_sym
)(struct page
*page
,
30 unsigned long end_bitidx
,
33 unsigned long wrapper_get_pfnblock_flags_mask(struct page
*page
,
35 unsigned long end_bitidx
,
38 WARN_ON_ONCE(!get_pfnblock_flags_mask_sym
);
39 if (get_pfnblock_flags_mask_sym
) {
40 struct irq_ibt_state irq_ibt_state
;
43 irq_ibt_state
= wrapper_irq_ibt_save();
44 ret
= get_pfnblock_flags_mask_sym(page
, pfn
, end_bitidx
, mask
);
45 wrapper_irq_ibt_restore(irq_ibt_state
);
51 EXPORT_SYMBOL_GPL(wrapper_get_pfnblock_flags_mask
);
53 int wrapper_get_pfnblock_flags_mask_init(void)
55 get_pfnblock_flags_mask_sym
=
56 (void *) kallsyms_lookup_funcptr("get_pfnblock_flags_mask");
57 if (!get_pfnblock_flags_mask_sym
)
61 EXPORT_SYMBOL_GPL(wrapper_get_pfnblock_flags_mask_init
);
64 * Canary function to check for 'get_pfnblock_flags_mask()' at compile time.
66 * From 'include/linux/pageblock-flags.h':
68 * unsigned long get_pfnblock_flags_mask(struct page *page,
70 * unsigned long end_bitidx,
71 * unsigned long mask);
73 __attribute__((unused
)) static
74 unsigned long __canary__get_pfnblock_flags_mask(struct page
*page
,
76 unsigned long end_bitidx
,
79 return get_pfnblock_flags_mask(page
, pfn
, end_bitidx
, mask
);
84 #include <linux/pageblock-flags.h>
88 #if (defined(CONFIG_KALLSYMS) \
89 && LTTNG_UBUNTU_KERNEL_RANGE(3,13,11,50, 3,14,0,0))
91 #include <linux/kallsyms.h>
92 #include <linux/mm_types.h>
93 #include <linux/module.h>
94 #include <wrapper/kallsyms.h>
95 #include <wrapper/page_alloc.h>
98 unsigned long (*get_pageblock_flags_mask_sym
)(struct page
*page
,
99 unsigned long end_bitidx
,
102 unsigned long wrapper_get_pageblock_flags_mask(struct page
*page
,
103 unsigned long end_bitidx
,
106 WARN_ON_ONCE(!get_pageblock_flags_mask_sym
);
107 if (get_pageblock_flags_mask_sym
) {
108 return get_pageblock_flags_mask_sym(page
, end_bitidx
, mask
);
113 EXPORT_SYMBOL_GPL(wrapper_get_pageblock_flags_mask
);
115 int wrapper_get_pageblock_flags_mask_init(void)
117 get_pageblock_flags_mask_sym
=
118 (void *) kallsyms_lookup_funcptr("get_pageblock_flags_mask");
119 if (!get_pageblock_flags_mask_sym
)
123 EXPORT_SYMBOL_GPL(wrapper_get_pfnblock_flags_mask_init
);
127 #include <linux/pageblock-flags.h>