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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * A generic stack depot implementation
4 *
5 * Author: Alexander Potapenko <glider@google.com>
6 * Copyright (C) 2016 Google, Inc.
7 *
8 * Based on code by Dmitry Chernenkov.
9 */
10
11#ifndef _LINUX_STACKDEPOT_H
12#define _LINUX_STACKDEPOT_H
13
14#include <linux/gfp.h>
15
16typedef u32 depot_stack_handle_t;
17
18depot_stack_handle_t __stack_depot_save(unsigned long *entries,
19 unsigned int nr_entries,
20 gfp_t gfp_flags, bool can_alloc);
21
22/*
23 * Every user of stack depot has to call this during its own init when it's
24 * decided that it will be calling stack_depot_save() later.
25 *
26 * The alternative is to select STACKDEPOT_ALWAYS_INIT to have stack depot
27 * enabled as part of mm_init(), for subsystems where it's known at compile time
28 * that stack depot will be used.
29 */
30int stack_depot_init(void);
31
32#ifdef CONFIG_STACKDEPOT_ALWAYS_INIT
33static inline int stack_depot_early_init(void) { return stack_depot_init(); }
34#else
35static inline int stack_depot_early_init(void) { return 0; }
36#endif
37
38depot_stack_handle_t stack_depot_save(unsigned long *entries,
39 unsigned int nr_entries, gfp_t gfp_flags);
40
41unsigned int stack_depot_fetch(depot_stack_handle_t handle,
42 unsigned long **entries);
43
44int stack_depot_snprint(depot_stack_handle_t handle, char *buf, size_t size,
45 int spaces);
46
47void stack_depot_print(depot_stack_handle_t stack);
48
49#endif