[PATCH 7/7] ARM: use dma-direct unconditionally

[Arnd Bergmann]

On Thu, Apr 21, 2022 at 9:42 AM Christoph Hellwig <hch at lst.de> wrote:
>
> Use dma-direct unconditionally on arm.  It has already been used for
> some time for LPAE and nommu configurations.
>
> This mostly changes the streaming mapping implementation and the (simple)
> coherent allocator for device that are DMA coherent.  The existing
> complex allocator for uncached mappings for non-coherent devices is still
> used as is using the arch_dma_alloc/arch_dma_free hooks.
>
> Signed-off-by: Christoph Hellwig <hch at lst.de>
> ---
>  arch/arm/Kconfig                   |   4 +-
>  arch/arm/include/asm/dma-mapping.h |  24 --
>  arch/arm/mach-highbank/highbank.c  |   2 +-
>  arch/arm/mach-mvebu/coherency.c    |   2 +-
>  arch/arm/mm/dma-mapping.c          | 365 ++---------------------------
>  5 files changed, 19 insertions(+), 378 deletions(-)
>  delete mode 100644 arch/arm/include/asm/dma-mapping.h

The diffstat looks really nice!

I can't really tell from looking at the code if this is an equivalent
conversion,
so I have to trust you on that. I did make sure this passes the basic tests
on kernelci.org, which tests a large number of machines, which is a good
sign.

Tested-by: Arnd Bergmann <arnd at arndb.de>