projects / lttng-modules.git / blame
| Commit | Line | Data |
|---|---|---|
| a90917c3 MD |
1 | #ifndef _LTTNG_WRAPPER_VMALLOC_H |
| 2 | #define _LTTNG_WRAPPER_VMALLOC_H | |
| b13f3ebe | 3 | |
| 6d2a620c | 4 | /* |
| 886d51a3 | 5 | * wrapper/vmalloc.h |
| 6d2a620c MD |
6 | * |
| 7 | * wrapper around vmalloc_sync_all. Using KALLSYMS to get its address when | |
| 8 | * available, else we need to have a kernel that exports this function to GPL | |
| 9 | * modules. | |
| 10 | * | |
| 886d51a3 MD |
11 | * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 12 | * | |
| 13 | * This library is free software; you can redistribute it and/or | |
| 14 | * modify it under the terms of the GNU Lesser General Public | |
| 15 | * License as published by the Free Software Foundation; only | |
| 16 | * version 2.1 of the License. | |
| 17 | * | |
| 18 | * This library is distributed in the hope that it will be useful, | |
| 19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 21 | * Lesser General Public License for more details. | |
| 22 | * | |
| 23 | * You should have received a copy of the GNU Lesser General Public | |
| 24 | * License along with this library; if not, write to the Free Software | |
| 25 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| 6d2a620c MD |
26 | */ |
| 27 | ||
| 28 | #ifdef CONFIG_KALLSYMS | |
| 29 | ||
| 30 | #include <linux/kallsyms.h> | |
| c539a324 | 31 | #include "kallsyms.h" |
| 6d2a620c MD |
32 | |
| 33 | static inline | |
| 34 | void wrapper_vmalloc_sync_all(void) | |
| 35 | { | |
| 36 | void (*vmalloc_sync_all_sym)(void); | |
| 37 | ||
| c539a324 | 38 | vmalloc_sync_all_sym = (void *) kallsyms_lookup_funcptr("vmalloc_sync_all"); |
| 6d2a620c MD |
39 | if (vmalloc_sync_all_sym) { |
| 40 | vmalloc_sync_all_sym(); | |
| 41 | } else { | |
| 42 | #ifdef CONFIG_X86 | |
| 43 | /* | |
| 44 | * Only x86 needs vmalloc_sync_all to make sure LTTng does not | |
| 45 | * trigger recursive page faults. | |
| 46 | */ | |
| 47 | printk(KERN_WARNING "LTTng: vmalloc_sync_all symbol lookup failed.\n"); | |
| 48 | printk(KERN_WARNING "Page fault handler and NMI tracing might trigger faults.\n"); | |
| 49 | #endif | |
| 50 | } | |
| 51 | } | |
| 52 | #else | |
| 53 | ||
| 54 | #include <linux/vmalloc.h> | |
| 55 | ||
| 56 | static inline | |
| 57 | void wrapper_vmalloc_sync_all(void) | |
| 58 | { | |
| 59 | return vmalloc_sync_all(); | |
| 60 | } | |
| 61 | #endif | |
| b13f3ebe | 62 | |
| a90917c3 | 63 | #endif /* _LTTNG_WRAPPER_VMALLOC_H */ |