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21b32bbf IM |
1 | /* |
2 | * arch/x86_64/kernel/stacktrace.c | |
3 | * | |
4 | * Stack trace management functions | |
5 | * | |
6 | * Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> | |
7 | */ | |
8 | #include <linux/sched.h> | |
9 | #include <linux/stacktrace.h> | |
c0b766f1 AK |
10 | #include <linux/module.h> |
11 | #include <asm/stacktrace.h> | |
21b32bbf | 12 | |
c0b766f1 | 13 | static void save_stack_warning(void *data, char *msg) |
21b32bbf | 14 | { |
21b32bbf IM |
15 | } |
16 | ||
c0b766f1 AK |
17 | static void |
18 | save_stack_warning_symbol(void *data, char *msg, unsigned long symbol) | |
21b32bbf | 19 | { |
21b32bbf IM |
20 | } |
21 | ||
c0b766f1 | 22 | static int save_stack_stack(void *data, char *name) |
21b32bbf | 23 | { |
ab1b6f03 | 24 | return -1; |
c0b766f1 | 25 | } |
21b32bbf | 26 | |
c0b766f1 AK |
27 | static void save_stack_address(void *data, unsigned long addr) |
28 | { | |
29 | struct stack_trace *trace = (struct stack_trace *)data; | |
30 | if (trace->skip > 0) { | |
31 | trace->skip--; | |
32 | return; | |
21b32bbf | 33 | } |
006e84ee | 34 | if (trace->nr_entries < trace->max_entries) |
c0b766f1 | 35 | trace->entries[trace->nr_entries++] = addr; |
21b32bbf IM |
36 | } |
37 | ||
c0b766f1 AK |
38 | static struct stacktrace_ops save_stack_ops = { |
39 | .warning = save_stack_warning, | |
40 | .warning_symbol = save_stack_warning_symbol, | |
41 | .stack = save_stack_stack, | |
42 | .address = save_stack_address, | |
43 | }; | |
21b32bbf IM |
44 | |
45 | /* | |
46 | * Save stack-backtrace addresses into a stack_trace buffer. | |
21b32bbf | 47 | */ |
ab1b6f03 | 48 | void save_stack_trace(struct stack_trace *trace) |
21b32bbf | 49 | { |
ab1b6f03 | 50 | dump_trace(current, NULL, NULL, &save_stack_ops, trace); |
006e84ee CM |
51 | if (trace->nr_entries < trace->max_entries) |
52 | trace->entries[trace->nr_entries++] = ULONG_MAX; | |
21b32bbf | 53 | } |
c0b766f1 | 54 | EXPORT_SYMBOL(save_stack_trace); |