[mkl-can:testing 1/1] include/linux/can/dev.h:113: undefined reference to `can_skb_headroom_valid'

[kbuild test robot <lkp@xxxxxxxxx>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can.git testing
head:   c2e15330b56ee5a41ad98c7266de21a3af259647
commit: c2e15330b56ee5a41ad98c7266de21a3af259647 [1/1] can: ensure an initialized headroom in outgoing CAN sk_buffs
config: x86_64-randconfig-s0-20191210 (attached as .config)
compiler: gcc-6 (Debian 6.3.0-18+deb9u1) 6.3.0 20170516
reproduce:
        git checkout c2e15330b56ee5a41ad98c7266de21a3af259647
        # save the attached .config to linux build tree
        make ARCH=x86_64 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

   ld: drivers/net/can/vcan.o: in function `can_dropped_invalid_skb':
>> include/linux/can/dev.h:113: undefined reference to `can_skb_headroom_valid'

vim +113 include/linux/can/dev.h

    95	
    96	/* Drop a given socketbuffer if it does not contain a valid CAN frame. */
    97	static inline bool can_dropped_invalid_skb(struct net_device *dev,
    98						  struct sk_buff *skb)
    99	{
   100		const struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
   101	
   102		if (skb->protocol == htons(ETH_P_CAN)) {
   103			if (unlikely(skb->len != CAN_MTU ||
   104				     cfd->len > CAN_MAX_DLEN))
   105				goto inval_skb;
   106		} else if (skb->protocol == htons(ETH_P_CANFD)) {
   107			if (unlikely(skb->len != CANFD_MTU ||
   108				     cfd->len > CANFD_MAX_DLEN))
   109				goto inval_skb;
   110		} else
   111			goto inval_skb;
   112	
 > 113		if (!can_skb_headroom_valid(dev, skb))
   114			goto inval_skb;
   115	
   116		return false;
   117	
   118	inval_skb:
   119		kfree_skb(skb);
   120		dev->stats.tx_dropped++;
   121		return true;
   122	}
   123	

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Attachment: .config.gz
Description: application/gzip