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Subjectdrivers/infiniband/hw/i40iw/i40iw_cm.c:2206:52: warning: 'arpindex' may be used uninitialized in this function
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: f55532a0c0b8bb6148f4e07853b876ef73bc69ca
commit: 520a07bff6fbb23cac905007d74c67058b189acb Merge branches 'i40iw', 'sriov' and 'hfi1' into k.o/for-4.6
date: 6 days ago
config: x86_64-randconfig-s5-03271744 (attached as .config)
reproduce:
git checkout 520a07bff6fbb23cac905007d74c67058b189acb
# save the attached .config to linux build tree
make ARCH=x86_64

Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings

All warnings (new ones prefixed by >>):

drivers/infiniband/hw/i40iw/i40iw_cm.c: In function 'i40iw_make_cm_node':
>> drivers/infiniband/hw/i40iw/i40iw_cm.c:2206:52: warning: 'arpindex' may be used uninitialized in this function [-Wmaybe-uninitialized]
ether_addr_copy(cm_node->rem_mac, iwdev->arp_table[arpindex].mac_addr);
^

vim +/arpindex +2206 drivers/infiniband/hw/i40iw/i40iw_cm.c

8d8cd0bf Faisal Latif 2016-02-26 2190 cm_info->loc_addr[0],
8d8cd0bf Faisal Latif 2016-02-26 2191 cm_info->rem_addr[0],
f27b4746 Faisal Latif 2016-01-20 2192 oldarpindex);
f27b4746 Faisal Latif 2016-01-20 2193 #if IS_ENABLED(CONFIG_IPV6)
f27b4746 Faisal Latif 2016-01-20 2194 else
f27b4746 Faisal Latif 2016-01-20 2195 arpindex = i40iw_addr_resolve_neigh_ipv6(iwdev,
8d8cd0bf Faisal Latif 2016-02-26 2196 cm_info->loc_addr,
8d8cd0bf Faisal Latif 2016-02-26 2197 cm_info->rem_addr,
f27b4746 Faisal Latif 2016-01-20 2198 oldarpindex);
f27b4746 Faisal Latif 2016-01-20 2199 #endif
f27b4746 Faisal Latif 2016-01-20 2200 }
f27b4746 Faisal Latif 2016-01-20 2201 if (arpindex < 0) {
f27b4746 Faisal Latif 2016-01-20 2202 i40iw_pr_err("cm_node arpindex\n");
f27b4746 Faisal Latif 2016-01-20 2203 kfree(cm_node);
f27b4746 Faisal Latif 2016-01-20 2204 return NULL;
f27b4746 Faisal Latif 2016-01-20 2205 }
f27b4746 Faisal Latif 2016-01-20 @2206 ether_addr_copy(cm_node->rem_mac, iwdev->arp_table[arpindex].mac_addr);
f27b4746 Faisal Latif 2016-01-20 2207 i40iw_add_hte_node(cm_core, cm_node);
f27b4746 Faisal Latif 2016-01-20 2208 cm_core->stats_nodes_created++;
f27b4746 Faisal Latif 2016-01-20 2209 return cm_node;
f27b4746 Faisal Latif 2016-01-20 2210 }
f27b4746 Faisal Latif 2016-01-20 2211
f27b4746 Faisal Latif 2016-01-20 2212 /**
f27b4746 Faisal Latif 2016-01-20 2213 * i40iw_rem_ref_cm_node - destroy an instance of a cm node
f27b4746 Faisal Latif 2016-01-20 2214 * @cm_node: connection's node

:::::: The code at line 2206 was first introduced by commit
:::::: f27b4746f378e033cd2f43c8116bd7cf39fc8575 i40iw: add connection management code

:::::: TO: Faisal Latif <faisal.latif@intel.com>
:::::: CC: Doug Ledford <dledford@redhat.com>

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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