projects / lttng-modules.git / blame
| Commit | Line | Data |
|---|---|---|
| 6d2a620c MD |
1 | /* |
| 2 | * Copyright (C) 2011 Mathieu Desnoyers (mathieu.desnoyers@efficios.com) | |
| 3 | * | |
| 4 | * wrapper around vmalloc_sync_all. Using KALLSYMS to get its address when | |
| 5 | * available, else we need to have a kernel that exports this function to GPL | |
| 6 | * modules. | |
| 7 | * | |
| 8 | * Dual LGPL v2.1/GPL v2 license. | |
| 9 | */ | |
| 10 | ||
| 11 | #ifdef CONFIG_KALLSYMS | |
| 12 | ||
| 13 | #include <linux/kallsyms.h> | |
| 14 | ||
| 15 | static inline | |
| 16 | void wrapper_vmalloc_sync_all(void) | |
| 17 | { | |
| 18 | void (*vmalloc_sync_all_sym)(void); | |
| 19 | ||
| 20 | vmalloc_sync_all_sym = (void *) kallsyms_lookup_name("vmalloc_sync_all"); | |
| 21 | if (vmalloc_sync_all_sym) { | |
| 22 | vmalloc_sync_all_sym(); | |
| 23 | } else { | |
| 24 | #ifdef CONFIG_X86 | |
| 25 | /* | |
| 26 | * Only x86 needs vmalloc_sync_all to make sure LTTng does not | |
| 27 | * trigger recursive page faults. | |
| 28 | */ | |
| 29 | printk(KERN_WARNING "LTTng: vmalloc_sync_all symbol lookup failed.\n"); | |
| 30 | printk(KERN_WARNING "Page fault handler and NMI tracing might trigger faults.\n"); | |
| 31 | #endif | |
| 32 | } | |
| 33 | } | |
| 34 | #else | |
| 35 | ||
| 36 | #include <linux/vmalloc.h> | |
| 37 | ||
| 38 | static inline | |
| 39 | void wrapper_vmalloc_sync_all(void) | |
| 40 | { | |
| 41 | return vmalloc_sync_all(); | |
| 42 | } | |
| 43 | #endif |