[dpdk-dev] [PATCH v3 01/10] mempool: silence -Wcast-align on pointer arithmetic

[Cyril Chemparathy]

Translating from a mempool object to the mempool pointer does not break
alignment constraints.  However, the compiler is unaware of this fact and
complains on -Wcast-align.  This patch modifies the code to use RTE_PTR_SUB(),
thereby silencing the compiler by casting through (void *).

Acked-by: Olivier Matz <olivier.matz at 6wind.com>
Signed-off-by: Cyril Chemparathy <cchemparathy at ezchip.com>
---
 lib/librte_mempool/rte_mempool.h | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/lib/librte_mempool/rte_mempool.h b/lib/librte_mempool/rte_mempool.h
index bc2bae0..8be040b 100644
--- a/lib/librte_mempool/rte_mempool.h
+++ b/lib/librte_mempool/rte_mempool.h
@@ -236,15 +236,13 @@ struct rte_mempool {
  */
 static inline struct rte_mempool **__mempool_from_obj(void *obj)
 {
-       struct rte_mempool **mpp;
        unsigned off;

        off = sizeof(struct rte_mempool *);
 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
        off += sizeof(uint64_t);
 #endif
-       mpp = (struct rte_mempool **)((char *)obj - off);
-       return mpp;
+       return RTE_PTR_SUB(obj, off);
 }

 /**
-- 
2.1.2