[dpdk-dev] [PATCH v3 29/40] rte_mbuf.h: explicit cast restricting ptrdiff to uint16_t

[Andy Green]

/projects/lagopus/src/dpdk/build/include/rte_common.h:141:34:
warning: conversion from 'long unsigned int' to 'uint16_t'
{aka 'short unsigned int'} may change value [-Wconversion]
 #define RTE_PTR_DIFF(ptr1, ptr2) ((uintptr_t)(ptr1) -
(uintptr_t)(ptr2))
                                  ^
/projects/lagopus/src/dpdk/build/include/rte_mbuf.h:1360:13:
note: in expansion of macro 'RTE_PTR_DIFF'
  *buf_len = RTE_PTR_DIFF(shinfo, buf_addr);

Signed-off-by: Andy Green <a...@warmcat.com>
---
 lib/librte_mbuf/rte_mbuf.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h
index a27dbb878..0580ec8a0 100644
--- a/lib/librte_mbuf/rte_mbuf.h
+++ b/lib/librte_mbuf/rte_mbuf.h
@@ -1358,7 +1358,7 @@ rte_pktmbuf_ext_shinfo_init_helper(void *buf_addr, 
uint16_t *buf_len,
        shinfo->fcb_opaque = fcb_opaque;
        rte_mbuf_ext_refcnt_set(shinfo, 1);
 
-       *buf_len = RTE_PTR_DIFF(shinfo, buf_addr);
+       *buf_len = (uint16_t)RTE_PTR_DIFF(shinfo, buf_addr);
        return shinfo;
 }