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Date: Thu, 17 May 2018 11:50:42 +0100
From: Bruce Richardson <bruce.richardson@intel.com>
To: Andy Green <andy@warmcat.com>
Cc: dev@dpdk.org
Message-ID: <20180517105042.GC22048@bricha3-MOBL.ger.corp.intel.com>
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Organization: Intel Research and Development Ireland Ltd.
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Subject: Re: [dpdk-dev] [PATCH v4 11/23] rte_mbuf.h: explicit cast
restricting ptrdiff to uint16
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On Mon, May 14, 2018 at 01:10:22PM +0800, Andy Green wrote:
> /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 <andy@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;
> }
Acked-by: Bruce Richardson <bruce.richardson@intel.com>