[PATCH v2 00/21] Allow compile-testing NO_DMA (drivers)

Geert Uytterhoeven geert at linux-m68k.org
Tue Apr 17 10:48:01 PDT 2018

Hi Rob,

On Thu, Apr 5, 2018 at 2:32 AM, Rob Herring <robherring2 at gmail.com> wrote:
> On Fri, Mar 16, 2018 at 8:51 AM, Geert Uytterhoeven
> <geert at linux-m68k.org> wrote:
>> If NO_DMA=y, get_dma_ops() returns a reference to the non-existing
>> symbol bad_dma_ops, thus causing a link failure if it is ever used.
>> The intention of this is twofold:
>>   1. To catch users of the DMA API on systems that do no support the DMA
>>      mapping API,
>>   2. To avoid building drivers that cannot work on such systems anyway.
>> However, the disadvantage is that we have to keep on adding dependencies
>> on HAS_DMA all over the place.
>> Thanks to the COMPILE_TEST symbol, lots of drivers now depend on one or
>> more platform dependencies (that imply HAS_DMA) || COMPILE_TEST, thus
>> already covering intention #2.  Having to add an explicit dependency on
>> HAS_DMA here is cumbersome, and hinders compile-testing.
> The same can be said for CONFIG_IOMEM and CONFIG_OF. Any plans to
> remove those too? CONFIG_IOMEM is mostly just a !CONFIG_UM option.

Perhaps, if time permits...



Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

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