/* * 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);