stack_trace_save_regs
unsigned int stack_trace_save_regs(struct pt_regs *regs, unsigned long *store,
nr_entries = stack_trace_save_regs(regs, fstack->calls,
ret = stack_trace_save_regs(regs, stack_buf, STACK_BUF_SIZE, 0);
ret = stack_trace_save_regs(regs, stack_buf, STACK_BUF_SIZE, 0);
num_stack_entries = stack_trace_save_regs(regs, stack_entries, KFENCE_STACK_DEPTH, 0);