Re: [PATCH 3/5] dma-mapping: make support for dma ops optional

[Guenter Roeck]

On Wed, Jul 08, 2020 at 05:24:47PM +0200, Christoph Hellwig wrote:
> Avoid the overhead of the dma ops support for tiny builds that only
> use the direct mapping.
> 
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>

For ppc:pmac32_defconfig and other configurations, this patch results in:

Error log:
drivers/macintosh/macio_asic.c: In function 'macio_add_one_device':
drivers/macintosh/macio_asic.c:393:16: error: 'struct device' has no member named 'dma_ops'
  393 |  dev->ofdev.dev.dma_ops = chip->lbus.pdev->dev.dma_ops;
      |                ^
drivers/macintosh/macio_asic.c:393:47: error: 'struct device' has no member named 'dma_ops'
  393 |  dev->ofdev.dev.dma_ops = chip->lbus.pdev->dev.dma_ops;
      |                                               ^

Bisect log attached.

Guenter

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# bad: [aab7ee9f8ff0110bfcd594b33dc33748dc1baf46] Add linux-next specific files for 20200717
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# bad: [249542813648f7a278895ad25674d3e147f49ad6] dma-mapping: make support for dma ops optional
git bisect bad 249542813648f7a278895ad25674d3e147f49ad6
# good: [b4174173005972f8f6497883d08d87e0aba1b604] dma-mapping: inline the fast path dma-direct calls
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# first bad commit: [249542813648f7a278895ad25674d3e147f49ad6] dma-mapping: make support for dma ops optional