https://bugs.dpdk.org/show_bug.cgi?id=452
Bug ID: 452
Summary: cuckoo hash gcc10 warning
Product: DPDK
Version: 20.05
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: Normal
Component: core
Assignee: dev@dpdk.org
Reporter: kevu...@gmail.com
Target Milestone: ---
[1/83] Compiling C object
'lib/76b5a35@@rte_hash@sta/librte_hash_rte_cuckoo_hash.c.o'
../lib/librte_hash/rte_cuckoo_hash.c: In function
‘__rte_hash_add_key_with_hash’:
../lib/librte_hash/rte_cuckoo_hash.c:1104:29: warning: ‘ext_bkt_id’ may be used
uninitialized in this function [-Wmaybe-uninitialized]
1104 | (h->buckets_ext[ext_bkt_id - 1]).sig_current[0] = short_sig;
| ~~~~~~~~~~~^~~
Relevant code:
if (rte_ring_sc_dequeue_elem(h->free_ext_bkts, &ext_bkt_id,
sizeof(uint32_t)) != 0) {
ret = -ENOSPC;
goto failure;
}
/* Use the first location of the new bucket */
(h->buckets_ext[ext_bkt_id - 1]).sig_current[0] = short_sig;
--
I'm not seeing the path that where rte_ring_sc_dequeue_elem() return !=0 and
ext_bkt_id has not been initialized but gcc10 seems to think there is one.
Initializing ext_bkt_id = 1 earlier in the function would fix this.
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