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Date:   Mon, 6 Jul 2020 12:42:27 -0700
From:   Jonathan Lemon <>
To:     Christoph Hellwig <>
Cc:     Björn Töpel <>,
        Magnus Karlsson <>,,,,
Subject: Re: [PATCH 1/4] dma-mapping: add a new dma_need_sync API

On Mon, Jun 29, 2020 at 03:03:56PM +0200, Christoph Hellwig wrote:
> Add a new API to check if calls to dma_sync_single_for_{device,cpu} are
> required for a given DMA streaming mapping.
> +::
> +
> +	bool
> +	dma_need_sync(struct device *dev, dma_addr_t dma_addr);
> +
> +Returns %true if dma_sync_single_for_{device,cpu} calls are required to
> +transfer memory ownership.  Returns %false if those calls can be skipped.

Hi Christoph -

Thie call above is for a specific dma_addr.  For correctness, would I
need to check every addr, or can I assume that for a specific memory
type (pages returned from malloc), that the answer would be identical?

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