From: Jan Blunck <jblunck@infradead.org>
To: dev@dpdk.org
Subject: [dpdk-dev] [PATCH 1/2] Fix container_of() macro to work with const members
Date: Tue, 14 Feb 2017 15:36:05 +0100 [thread overview]
Message-ID: <1487082966-21074-1-git-send-email-jblunck@infradead.org> (raw)
This fixes the usage of structure members that are declared const to get
a pointer to the embedding parent structure.
Signed-off-by: Jan Blunck <jblunck@infradead.org>
---
lib/librte_eal/common/include/rte_common.h | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/lib/librte_eal/common/include/rte_common.h b/lib/librte_eal/common/include/rte_common.h
index 8dda3e2..c421708 100644
--- a/lib/librte_eal/common/include/rte_common.h
+++ b/lib/librte_eal/common/include/rte_common.h
@@ -347,8 +347,9 @@ rte_bsf32(uint32_t v)
*/
#ifndef container_of
#define container_of(ptr, type, member) __extension__ ({ \
- typeof(((type *)0)->member) *_ptr = (ptr); \
- (type *)(((char *)_ptr) - offsetof(type, member)); })
+ const typeof(((type *)0)->member) *_ptr = (ptr); \
+ (type *)(((uintptr_t)_ptr) - offsetof(type, member)); \
+ })
#endif
#define _RTE_STR(x) #x
--
2.7.4
next reply other threads:[~2017-02-14 14:36 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-14 14:36 Jan Blunck [this message]
2017-02-14 14:36 ` [dpdk-dev] [PATCH 2/2] Ensure constness of target pointer type Jan Blunck
2017-02-27 14:28 ` [dpdk-dev] [PATCH 1/2] Fix container_of() macro to work with const members Jan Blunck
2017-02-27 15:14 ` Bruce Richardson
2017-03-08 14:01 ` Thomas Monjalon
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