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 MD |
4 | /* |
| 5 | * Copyright (C) 2011 Mathieu Desnoyers (mathieu.desnoyers@efficios.com) | |
| 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 | * | |
| 11 | * Dual LGPL v2.1/GPL v2 license. | |
| 12 | */ | |
| 13 | ||
| 14 | #ifdef CONFIG_KALLSYMS | |
| 15 | ||
| 16 | #include <linux/kallsyms.h> | |
| c539a324 | 17 | #include "kallsyms.h" |
| 6d2a620c MD |
18 | |
| 19 | static inline | |
| 20 | void wrapper_vmalloc_sync_all(void) | |
| 21 | { | |
| 22 | void (*vmalloc_sync_all_sym)(void); | |
| 23 | ||
| c539a324 | 24 | vmalloc_sync_all_sym = (void *) kallsyms_lookup_funcptr("vmalloc_sync_all"); |
| 6d2a620c MD |
25 | if (vmalloc_sync_all_sym) { |
| 26 | vmalloc_sync_all_sym(); | |
| 27 | } else { | |
| 28 | #ifdef CONFIG_X86 | |
| 29 | /* | |
| 30 | * Only x86 needs vmalloc_sync_all to make sure LTTng does not | |
| 31 | * trigger recursive page faults. | |
| 32 | */ | |
| 33 | printk(KERN_WARNING "LTTng: vmalloc_sync_all symbol lookup failed.\n"); | |
| 34 | printk(KERN_WARNING "Page fault handler and NMI tracing might trigger faults.\n"); | |
| 35 | #endif | |
| 36 | } | |
| 37 | } | |
| 38 | #else | |
| 39 | ||
| 40 | #include <linux/vmalloc.h> | |
| 41 | ||
| 42 | static inline | |
| 43 | void wrapper_vmalloc_sync_all(void) | |
| 44 | { | |
| 45 | return vmalloc_sync_all(); | |
| 46 | } | |
| 47 | #endif | |
| b13f3ebe | 48 | |
| a90917c3 | 49 | #endif /* _LTTNG_WRAPPER_VMALLOC_H */ |