kernel/trace/bpf_trace.c

672 	int nest_level, err;
676 	nest_level = this_cpu_inc_return(bpf_trace_nest_level);
678 	if (WARN_ON_ONCE(nest_level > ARRAY_SIZE(sds->sds))) {
683 	sd = &sds->sds[nest_level - 1];
737 	int nest_level;
741 	nest_level = this_cpu_inc_return(bpf_event_output_nest_level);
743 	if (WARN_ON_ONCE(nest_level > ARRAY_SIZE(bpf_misc_sds.sds))) {
747 	sd = this_cpu_ptr(&bpf_misc_sds.sds[nest_level - 1]);
748 	regs = this_cpu_ptr(&bpf_pt_regs.regs[nest_level - 1]);
1912 	int nest_level = this_cpu_inc_return(bpf_raw_tp_nest_level);
1914 	if (WARN_ON_ONCE(nest_level > ARRAY_SIZE(tp_regs->regs))) {
1919 	return &tp_regs->regs[nest_level - 1];