Re: [PATCH net-next 5/5] mctp: Add SIOCMCTP{ALLOC,DROP}TAG ioctls for tag control

Hi Jeremy,

I love your patch! Perhaps something to improve:

[auto build test WARNING on net-next/master]

url:    https://github.com/0day-ci/linux/commits/Jeremy-Kerr/MCTP-tag-control-interface/20220208-195325
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git c3e676b98326a419f30dd5d956c68fc33323f4fd
config: nios2-randconfig-r021-20220208 (https://download.01.org/0day-ci/archive/20220209/202202090043.BhR7muS4-lkp@intel.com/config)
compiler: nios2-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/a1d553f399d7457bd3e455cd3f5e10dddb4bc2bf
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Jeremy-Kerr/MCTP-tag-control-interface/20220208-195325
        git checkout a1d553f399d7457bd3e455cd3f5e10dddb4bc2bf
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=nios2 SHELL=/bin/bash kernel/ net/mctp/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <redacted>

All warnings (new ones prefixed by >>):

quoted

net/mctp/route.c:660:21: warning: no previous prototype for 'mctp_lookup_prealloc_tag' [-Wmissing-prototypes]

     660 | struct mctp_sk_key *mctp_lookup_prealloc_tag(struct mctp_sock *msk,
         |                     ^~~~~~~~~~~~~~~~~~~~~~~~


vim +/mctp_lookup_prealloc_tag +660 net/mctp/route.c

   659	
 > 660	struct mctp_sk_key *mctp_lookup_prealloc_tag(struct mctp_sock *msk,
   661						     mctp_eid_t daddr, u8 req_tag,
   662						     u8 *tagp)
   663	{
   664		struct net *net = sock_net(&msk->sk);
   665		struct netns_mctp *mns = &net->mctp;
   666		struct mctp_sk_key *key, *tmp;
   667		unsigned long flags;
   668	
   669		req_tag &= ~(MCTP_TAG_PREALLOC | MCTP_TAG_OWNER);
   670		key = NULL;
   671	
   672		spin_lock_irqsave(&mns->keys_lock, flags);
   673	
   674		hlist_for_each_entry(tmp, &mns->keys, hlist) {
   675			if (tmp->tag != req_tag)
   676				continue;
   677	
   678			if (!(tmp->peer_addr == daddr || tmp->peer_addr == MCTP_ADDR_ANY))
   679				continue;
   680	
   681			if (!tmp->manual_alloc)
   682				continue;
   683	
   684			spin_lock(&tmp->lock);
   685			if (tmp->valid) {
   686				key = tmp;
   687				refcount_inc(&key->refs);
   688				spin_unlock(&tmp->lock);
   689				break;
   690			}
   691			spin_unlock(&tmp->lock);
   692		}
   693		spin_unlock_irqrestore(&mns->keys_lock, flags);
   694	
   695		if (!key)
   696			return ERR_PTR(-ENOENT);
   697	
   698		if (tagp)
   699			*tagp = key->tag;
   700	
   701		return key;
   702	}
   703	

---
0-DAY CI Kernel Test Service, Intel Corporation
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