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mempool: silence warning on pointer arithmetic

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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 *).

Signed-off-by: Cyril Chemparathy <cchemparathy@ezchip.com>
Acked-by: Olivier Matz <olivier.matz@6wind.com>
This commit is contained in:
Cyril Chemparathy 2015-06-22 11:34:15 -07:00 committed by Thomas Monjalon
parent 3b5e1551b3
commit 6cf14ce4ce
2 changed files with 3 additions and 5 deletions
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2
lib/librte_mempool/rte_mempool.c
View File

@ -136,7 +136,7 @@ mempool_add_elem(struct rte_mempool *mp, void *obj, uint32_t obj_idx,
obj = (char *)obj + mp->header_size;
/* set mempool ptr in header */
hdr = (struct rte_mempool_objhdr *)((char *)obj - sizeof(*hdr));
hdr = RTE_PTR_SUB(obj, sizeof(*hdr));
hdr->mp = mp;
#ifdef RTE_LIBRTE_MEMPOOL_DEBUG

6
lib/librte_mempool/rte_mempool.h
View File

@ -262,15 +262,13 @@ struct rte_mempool {
/* return the header of a mempool object (internal) */
static inline struct rte_mempool_objhdr *__mempool_get_header(void *obj)
{
return (struct rte_mempool_objhdr *)((char *)obj -
sizeof(struct rte_mempool_objhdr));
return RTE_PTR_SUB(obj, sizeof(struct rte_mempool_objhdr));
}
/* return the trailer of a mempool object (internal) */
static inline struct rte_mempool_objtlr *__mempool_get_trailer(void *obj)
{
return (struct rte_mempool_objtlr *)((char *)obj -
sizeof(struct rte_mempool_objtlr));
return RTE_PTR_SUB(obj, sizeof(struct rte_mempool_objtlr));
}
/**