patches for DPDK stable branches
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From: David Christensen <drc@linux.vnet.ibm.com>
To: dev@dpdk.org, beilei.xing@intel.com
Cc: stable@dpdk.org, David Christensen <drc@linux.vnet.ibm.com>
Subject: [dpdk-stable] [PATCH] net/i40e: fix gcc 11 build warning on POWER architecture
Date: Thu, 14 Oct 2021 12:05:00 -0700
Message-ID: <20211014190500.2657413-1-drc@linux.vnet.ibm.com> (raw)

Building DPDK with a gcc 11 based compiler such as the IBM Advanced
Toolchain 15 (1) generates a stringop-overflow warning when using -O3
optimization (DPDK default for production releases):

writing 1 byte into a region of size 0 [-Wstringop-overflow=]

The issue has been reported to the gcc project (2) but can be resolved
by preventing the compiler from unrolling the loop as part of the -O3
optimization.

(1) https://www.ibm.com/support/pages/advance-toolchain-linux-power
(2) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102316

Bugzilla ID: 743

Signed-off-by: David Christensen <drc@linux.vnet.ibm.com>
---
 drivers/net/i40e/i40e_flow.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/i40e/i40e_flow.c b/drivers/net/i40e/i40e_flow.c
index e41a84f1d7..17ab7ad9b9 100644
--- a/drivers/net/i40e/i40e_flow.c
+++ b/drivers/net/i40e/i40e_flow.c
@@ -3047,6 +3047,10 @@ i40e_flow_parse_fdir_pattern(struct rte_eth_dev *dev,
 				return -rte_errno;
 			}
 
+#if defined(RTE_ARCH_PPC_64) && defined(RTE_TOOLCHAIN_GCC) && \
+(GCC_VERSION >= 110000)
+#pragma GCC unroll 1
+#endif
 			for (i = 0; i < raw_spec->length; i++) {
 				j = i + next_dst_off;
 				filter->input.flow_ext.flexbytes[j] =
-- 
2.27.0


             reply	other threads:[~2021-10-14 19:05 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-14 19:05 David Christensen [this message]
2021-11-05  0:50 ` [dpdk-stable] [dpdk-dev] " Zhang, Qi Z
2021-11-09 22:46   ` David Christensen

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