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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_STACKTRACE_H
#define __LINUX_STACKTRACE_H
#include <linux/types.h>
struct task_struct;
struct pt_regs;
#ifdef CONFIG_STACKTRACE
struct stack_trace {
unsigned int nr_entries, max_entries;
unsigned long *entries;
int skip; /* input argument: How many entries to skip */
};
extern void save_stack_trace(struct stack_trace *trace);
extern void save_stack_trace_regs(struct pt_regs *regs,
struct stack_trace *trace);
extern void save_stack_trace_tsk(struct task_struct *tsk,
struct stack_trace *trace);
extern int save_stack_trace_tsk_reliable(struct task_struct *tsk,
struct stack_trace *trace);
extern void print_stack_trace(struct stack_trace *trace, int spaces);
extern int snprint_stack_trace(char *buf, size_t size,
struct stack_trace *trace, int spaces);
#ifdef CONFIG_USER_STACKTRACE_SUPPORT
extern void save_stack_trace_user(struct stack_trace *trace);
#else
# define save_stack_trace_user(trace) do { } while (0)
#endif
#else /* !CONFIG_STACKTRACE */
# define save_stack_trace(trace) do { } while (0)
# define save_stack_trace_tsk(tsk, trace) do { } while (0)
# define save_stack_trace_user(trace) do { } while (0)
# define print_stack_trace(trace, spaces) do { } while (0)
# define snprint_stack_trace(buf, size, trace, spaces) do { } while (0)
# define save_stack_trace_tsk_reliable(tsk, trace) ({ -ENOSYS; })
#endif /* CONFIG_STACKTRACE */
#endif /* __LINUX_STACKTRACE_H */
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