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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
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

             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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