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From: Jan Blunck <jblunck@infradead.org>
To: dev@dpdk.org
Subject: [dpdk-dev] [PATCH 2/2] Ensure constness of target pointer type
Date: Tue, 14 Feb 2017 15:36:06 +0100
Message-ID: <1487082966-21074-2-git-send-email-jblunck@infradead.org> (raw)
In-Reply-To: <1487082966-21074-1-git-send-email-jblunck@infradead.org>

This adds a check to ensure that the container_of() macro is not used to
cast away (remove) constness.

Signed-off-by: Jan Blunck <jblunck@infradead.org>
 lib/librte_eal/common/include/rte_common.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/librte_eal/common/include/rte_common.h b/lib/librte_eal/common/include/rte_common.h
index c421708..e057f6e 100644
--- a/lib/librte_eal/common/include/rte_common.h
+++ b/lib/librte_eal/common/include/rte_common.h
@@ -348,6 +348,8 @@ rte_bsf32(uint32_t v)
 #ifndef container_of
 #define container_of(ptr, type, member)	__extension__ ({		\
 			const typeof(((type *)0)->member) *_ptr = (ptr); \
+			__attribute__((unused)) type *_target_ptr =	\
+				(type *)(ptr);				\
 			(type *)(((uintptr_t)_ptr) - offsetof(type, member)); \

  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 [dpdk-dev] [PATCH 1/2] Fix container_of() macro to work with const members Jan Blunck
2017-02-14 14:36 ` Jan Blunck [this message]
2017-02-27 14:28 ` Jan Blunck
2017-02-27 15:14   ` Bruce Richardson
2017-03-08 14:01     ` Thomas Monjalon

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