From: Michael Qiu <qdy220091330@gmail.com>
To: dev@dpdk.org
Subject: [dpdk-dev] [PATCH v3] test-pmd: Fix pointer aliasing error
Date: Thu, 4 Dec 2014 12:16:04 +0800 [thread overview]
Message-ID: <1417666564-19950-1-git-send-email-michael.qiu@intel.com> (raw)
In-Reply-To: <1417663711-19576-1-git-send-email-michael.qiu@intel.com>
app/test-pmd/csumonly.c: In function ‘get_psd_sum’:
build/include/rte_ip.h:161: error: dereferencing pointer ‘u16’
does break strict-aliasing rules
build/include/rte_ip.h:157: note: initialized from here
...
The root cause is that, compile enable strict aliasing by default,
while in function rte_raw_cksum() try to convert 'const char *'
to 'const uint16_t *'.
This patch is one workaround fix.
Signed-off-by: Michael Qiu <michael.qiu@intel.com>
---
v3 --> v2:
use uintptr_t instead of unsigned long to
save pointer.
v2 --> v1:
Workaround solution instead of shut off the
gcc params.
lib/librte_net/rte_ip.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/lib/librte_net/rte_ip.h b/lib/librte_net/rte_ip.h
index 61e4457..cda3436 100644
--- a/lib/librte_net/rte_ip.h
+++ b/lib/librte_net/rte_ip.h
@@ -154,7 +154,8 @@ struct ipv4_hdr {
static inline uint16_t
rte_raw_cksum(const char *buf, size_t len)
{
- const uint16_t *u16 = (const uint16_t *)buf;
+ uintptr_t ptr = (uintptr_t)buf;
+ const uint16_t *u16 = (const uint16_t *)ptr;
uint32_t sum = 0;
while (len >= (sizeof(*u16) * 4)) {
--
1.9.3
next prev parent reply other threads:[~2014-12-04 13:34 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1417606044-3432-1-git-send-email-michael.qiu@intel.com>
[not found] ` <1417606099-3489-1-git-send-email-michael.qiu@intel.com>
2014-12-03 11:42 ` [dpdk-dev] [PATCH] " Bruce Richardson
2014-12-03 13:59 ` Qiu, Michael
2014-12-03 14:51 ` Bruce Richardson
2014-12-03 15:19 ` Qiu, Michael
2014-12-03 15:36 ` Bruce Richardson
2014-12-04 2:38 ` Qiu, Michael
2014-12-04 3:28 ` [dpdk-dev] [PATCH v2] " Michael Qiu
2014-12-04 4:16 ` Michael Qiu [this message]
2014-12-05 5:34 ` [dpdk-dev] [PATCH v3] " Qiu, Michael
2014-12-05 9:24 ` Thomas Monjalon
2014-12-08 1:28 ` Qiu, Michael
2014-12-08 1:30 ` Qiu, Michael
2014-12-10 3:44 ` Qiu, Michael
2014-12-11 0:54 ` Thomas Monjalon
2014-12-11 17:51 ` r k
2014-12-12 6:49 ` Qiu, Michael
2014-12-04 12:54 ` [dpdk-dev] [PATCH v2] " Ananyev, Konstantin
2014-12-03 15:24 ` [dpdk-dev] [PATCH] " Olivier MATZ
2014-12-03 16:03 ` Dayu Qiu
2014-12-03 15:57 ` Dayu Qiu
2014-12-03 16:26 ` [dpdk-dev] [PATCH] test-pmd: Fix "__BYTE_ORDER__" not defined error Qiu, Michael
2014-12-03 19:59 ` Thomas Monjalon
2014-12-03 20:47 ` [dpdk-dev] [PATCH 0/2] fix endianness in EAL Thomas Monjalon
2014-12-03 20:47 ` [dpdk-dev] [PATCH 1/2] eal: detect endianness Thomas Monjalon
2014-12-04 2:28 ` Qiu, Michael
2014-12-04 9:00 ` Thomas Monjalon
2014-12-04 10:28 ` Qiu, Michael
2014-12-04 12:19 ` Thomas Monjalon
2014-12-04 12:50 ` Qiu, Michael
2014-12-03 20:47 ` [dpdk-dev] [PATCH 2/2] app/testpmd: fix endianness detection Thomas Monjalon
2014-12-04 9:28 ` [dpdk-dev] [PATCH 0/2] fix endianness in EAL Chao Zhu
2014-12-05 16:01 ` Thomas Monjalon
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