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From: Joyce Kong <joyce.kong@arm.com>
To: reshma.pattan@intel.com, stephen@networkplumber.org,
konstantin.v.ananyev@yandex.ru
Cc: dev@dpdk.org, nd@arm.com, Joyce Kong <joyce.kong@arm.com>, stable@dpdk.org,
Ruifeng Wang <ruifeng.wang@arm.com>
Subject: [PATCH] pdump: fix build issue with GCC 12
Date: Mon, 27 Mar 2023 07:07:12 +0000
Message-Id: <20230327070712.280265-1-joyce.kong@arm.com>
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The following warning is observed with GCC12 compilation
with release 20.11:
In function ‘__rte_ring_enqueue_elems_64’,
inlined from ‘__rte_ring_enqueue_elems’ at
../lib/librte_ring/rte_ring_elem.h:225:3,
inlined from ‘__rte_ring_do_enqueue_elem’ at
../lib/librte_ring/rte_ring_elem.h:424:2,
inlined from ‘rte_ring_mp_enqueue_burst_elem’ at
../lib/librte_ring/rte_ring_elem.h:884:9,
inlined from ‘rte_ring_enqueue_burst_elem’ at
../lib/librte_ring/rte_ring_elem.h:946:10,
inlined from ‘rte_ring_enqueue_burst’ at
../lib/librte_ring/rte_ring.h:721:9,
inlined from ‘pdump_copy’ at
../lib/librte_pdump/rte_pdump.c:94:13:
../lib/librte_ring/rte_ring_elem.h:162:40: warning: ‘*dup_bufs.36_42
+ _89’ may be used uninitialized [-Wmaybe-uninitialized]
162 | ring[idx] = obj[i];
| ~~~^~~
../lib/librte_ring/rte_ring_elem.h:163:44: warning: ‘*dup_bufs.36_42
+ _98’ may be used uninitialized [-Wmaybe-uninitialized]
163 | ring[idx + 1] = obj[i + 1];
| ~~~^~~~~~~
../lib/librte_ring/rte_ring_elem.h:164:44: warning: ‘*dup_bufs.36_42
+ _107’ may be used uninitialized [-Wmaybe-uninitialized]
164 | ring[idx + 2] = obj[i + 2];
| ~~~^~~~~~~
../lib/librte_ring/rte_ring_elem.h:165:44: warning: ‘*dup_bufs.36_42
+ _116’ may be used uninitialized [-Wmaybe-uninitialized]
165 | ring[idx + 3] = obj[i + 3];
| ~~~^~~~~~~
../lib/librte_ring/rte_ring_elem.h:169:42: warning: ‘*dup_bufs.36_42
+ _129’ may be used uninitialized [-Wmaybe-uninitialized]
169 | ring[idx++] = obj[i++]; /* fallthrough */
| ~~~^~~~~
../lib/librte_ring/rte_ring_elem.h:171:42: warning: ‘*dup_bufs.36_42
+ _139’ may be used uninitialized [-Wmaybe-uninitialized]
171 | ring[idx++] = obj[i++]; /* fallthrough */
| ~~~^~~~~
../lib/librte_ring/rte_ring_elem.h:173:42: warning: ‘*dup_bufs.36_42
+ _149’ may be used uninitialized [-Wmaybe-uninitialized]
173 | ring[idx++] = obj[i++];
Actually, this is an alias warning as -O3 enables strict alias.
This patch fixes it by replacing 'dup_bufs' with '&dup_bufs[0]'
as the compiler represents them differently.
Fixes: 278f945402c5 ("pdump: add new library for packet capture")
Cc: stable@dpdk.org
Signed-off-by: Joyce Kong <joyce.kong@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
---
lib/pdump/rte_pdump.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/pdump/rte_pdump.c b/lib/pdump/rte_pdump.c
index 9bc4bab4f2..53cca1034d 100644
--- a/lib/pdump/rte_pdump.c
+++ b/lib/pdump/rte_pdump.c
@@ -134,7 +134,7 @@ pdump_copy(uint16_t port_id, uint16_t queue,
__atomic_fetch_add(&stats->accepted, d_pkts, __ATOMIC_RELAXED);
- ring_enq = rte_ring_enqueue_burst(ring, (void *)dup_bufs, d_pkts, NULL);
+ ring_enq = rte_ring_enqueue_burst(ring, (void *)&dup_bufs[0], d_pkts, NULL);
if (unlikely(ring_enq < d_pkts)) {
unsigned int drops = d_pkts - ring_enq;
--
2.25.1