enable can1

hc

2023-11-30 6c9be420e167ee7ce45c0309586f09ddab28ac15

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// SPDX-License-Identifier: GPL-2.0
/*
 * Stack trace management functions
 *
 *  Copyright IBM Corp. 2006
 *  Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
 */
 
#include <linux/sched.h>
#include <linux/sched/debug.h>
#include <linux/stacktrace.h>
#include <linux/kallsyms.h>
#include <linux/export.h>
 
static int __save_address(void *data, unsigned long address, int nosched)
{
    struct stack_trace *trace = data;
 
    if (nosched && in_sched_functions(address))
        return 0;
    if (trace->skip > 0) {
        trace->skip--;
        return 0;
    }
    if (trace->nr_entries < trace->max_entries) {
        trace->entries[trace->nr_entries++] = address;
        return 0;
    }
    return 1;
}
 
static int save_address(void *data, unsigned long address, int reliable)
{
    return __save_address(data, address, 0);
}
 
static int save_address_nosched(void *data, unsigned long address, int reliable)
{
    return __save_address(data, address, 1);
}
 
void save_stack_trace(struct stack_trace *trace)
{
    unsigned long sp;
 
    sp = current_stack_pointer();
    dump_trace(save_address, trace, NULL, sp);
    if (trace->nr_entries < trace->max_entries)
        trace->entries[trace->nr_entries++] = ULONG_MAX;
}
EXPORT_SYMBOL_GPL(save_stack_trace);
 
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
{
    unsigned long sp;
 
    sp = tsk->thread.ksp;
    if (tsk == current)
        sp = current_stack_pointer();
    dump_trace(save_address_nosched, trace, tsk, sp);
    if (trace->nr_entries < trace->max_entries)
        trace->entries[trace->nr_entries++] = ULONG_MAX;
}
EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
 
void save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace)
{
    unsigned long sp;
 
    sp = kernel_stack_pointer(regs);
    dump_trace(save_address, trace, NULL, sp);
    if (trace->nr_entries < trace->max_entries)
        trace->entries[trace->nr_entries++] = ULONG_MAX;
}
EXPORT_SYMBOL_GPL(save_stack_trace_regs);