kstrtou16_from_user  438 include/linux/kernel.h int __must_check kstrtou16_from_user(const char __user *s, size_t count, unsigned int base, u16 *res);
kstrtou16_from_user  407 lib/kstrtox.c  kstrto_from_user(kstrtou16_from_user,	kstrtou16,	u16);