From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [net-next PATCH RFC 1/8] page_pool: add helper functions for
 DMA
Date: Fri, 07 Dec 2018 23:06:55 -0800 (PST)
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From: Jesper Dangaard Brouer <brouer@redhat.com>
Date: Fri, 07 Dec 2018 00:25:32 +0100

> From: Ilias Apalodimas <ilias.apalodimas@linaro.org>
> 
> Add helper functions for retreiving dma_addr_t stored in page_private and
> unmapping dma addresses, mapped via the page_pool API.
> 
> Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
> Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>

This isn't going to work on 32-bit platforms where dma_addr_t is a u64,
because the page private is unsigned long.

Grep for PHY_ADDR_T_64BIT under arch/ to see the vast majority of the
cases where this happens, then ARCH_DMA_ADDR_T_64BIT.