static int __ftrace_modify_code()

in kernel/ftrace.c [123:140]

• 15 lines of code
• 5 McCabe index (conditional complexity)

static int __ftrace_modify_code(unsigned long pc, unsigned long *old_insn,
				unsigned long *new_insn, bool validate)
{
	unsigned long orig_insn[3];

	if (validate) {
		if (copy_from_kernel_nofault(orig_insn, (void *)pc,
				MCOUNT_INSN_SIZE))
			return -EFAULT;
		if (memcmp(orig_insn, old_insn, MCOUNT_INSN_SIZE))
			return -EINVAL;
	}

	if (copy_to_kernel_nofault((void *)pc, new_insn, MCOUNT_INSN_SIZE))
		return -EPERM;

	return 0;
}