mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-17 00:26:58 +07:00
a297042164
Make it clear to humans and to the compiler that the stack trace
('entries') arguments are not modified.
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Waiman Long <longman@redhat.com>
Cc: Will Deacon <will.deacon@arm.com>
Link: https://lkml.kernel.org/r/20190722182443.216015-3-bvanassche@acm.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
94 lines
3.4 KiB
C
94 lines
3.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __LINUX_STACKTRACE_H
|
|
#define __LINUX_STACKTRACE_H
|
|
|
|
#include <linux/types.h>
|
|
#include <asm/errno.h>
|
|
|
|
struct task_struct;
|
|
struct pt_regs;
|
|
|
|
#ifdef CONFIG_STACKTRACE
|
|
void stack_trace_print(const unsigned long *trace, unsigned int nr_entries,
|
|
int spaces);
|
|
int stack_trace_snprint(char *buf, size_t size, const unsigned long *entries,
|
|
unsigned int nr_entries, int spaces);
|
|
unsigned int stack_trace_save(unsigned long *store, unsigned int size,
|
|
unsigned int skipnr);
|
|
unsigned int stack_trace_save_tsk(struct task_struct *task,
|
|
unsigned long *store, unsigned int size,
|
|
unsigned int skipnr);
|
|
unsigned int stack_trace_save_regs(struct pt_regs *regs, unsigned long *store,
|
|
unsigned int size, unsigned int skipnr);
|
|
unsigned int stack_trace_save_user(unsigned long *store, unsigned int size);
|
|
|
|
/* Internal interfaces. Do not use in generic code */
|
|
#ifdef CONFIG_ARCH_STACKWALK
|
|
|
|
/**
|
|
* stack_trace_consume_fn - Callback for arch_stack_walk()
|
|
* @cookie: Caller supplied pointer handed back by arch_stack_walk()
|
|
* @addr: The stack entry address to consume
|
|
* @reliable: True when the stack entry is reliable. Required by
|
|
* some printk based consumers.
|
|
*
|
|
* Return: True, if the entry was consumed or skipped
|
|
* False, if there is no space left to store
|
|
*/
|
|
typedef bool (*stack_trace_consume_fn)(void *cookie, unsigned long addr,
|
|
bool reliable);
|
|
/**
|
|
* arch_stack_walk - Architecture specific function to walk the stack
|
|
* @consume_entry: Callback which is invoked by the architecture code for
|
|
* each entry.
|
|
* @cookie: Caller supplied pointer which is handed back to
|
|
* @consume_entry
|
|
* @task: Pointer to a task struct, can be NULL
|
|
* @regs: Pointer to registers, can be NULL
|
|
*
|
|
* ============ ======= ============================================
|
|
* task regs
|
|
* ============ ======= ============================================
|
|
* task NULL Stack trace from task (can be current)
|
|
* current regs Stack trace starting on regs->stackpointer
|
|
* ============ ======= ============================================
|
|
*/
|
|
void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,
|
|
struct task_struct *task, struct pt_regs *regs);
|
|
int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry, void *cookie,
|
|
struct task_struct *task);
|
|
void arch_stack_walk_user(stack_trace_consume_fn consume_entry, void *cookie,
|
|
const struct pt_regs *regs);
|
|
|
|
#else /* CONFIG_ARCH_STACKWALK */
|
|
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 save_stack_trace_user(struct stack_trace *trace);
|
|
#endif /* !CONFIG_ARCH_STACKWALK */
|
|
#endif /* CONFIG_STACKTRACE */
|
|
|
|
#if defined(CONFIG_STACKTRACE) && defined(CONFIG_HAVE_RELIABLE_STACKTRACE)
|
|
int stack_trace_save_tsk_reliable(struct task_struct *tsk, unsigned long *store,
|
|
unsigned int size);
|
|
#else
|
|
static inline int stack_trace_save_tsk_reliable(struct task_struct *tsk,
|
|
unsigned long *store,
|
|
unsigned int size)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
#endif
|
|
|
|
#endif /* __LINUX_STACKTRACE_H */
|