# Re: \[PATCH v2\] mm: generalize ZONE\_\[DMA\|DMA32\]

- From: Michael Ellerman \<mpe@ellerman.id.au\>
- Date: 2021-06-01 02:56:30 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2021/06/6508517
- Thread: https://ratatoskr.run/linux-alpha/2021/05/6508455/t.md

```text
Kefeng Wang [ref] writes:
> ZONE_[DMA|DMA32] configs have duplicate definitions on platforms
> that subscribe them. Instead, just make them generic options which
> can be selected on applicable platforms.
>
> Also only x86/arm64 architectures could enable both ZONE_DMA and
> ZONE_DMA32 if EXPERT, add ARCH_HAS_ZONE_DMA_SET to make dma zone
> configurable and visible on the two architectures.
>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Will Deacon <will@kernel.org>
> Cc: Geert Uytterhoeven <geert@linux-m68k.org>
> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Ingo Molnar <mingo@redhat.com>
> Cc: Borislav Petkov <bp@alien8.de>
> Cc: Palmer Dabbelt <palmer@dabbelt.com>
> Cc: Richard Henderson <redacted>
> Cc: Russell King <linux@armlinux.org.uk>
> Acked-by: Catalin Marinas <catalin.marinas@arm.com> # for arm64
> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> # for m68k
> Acked-by: Mike Rapoport <redacted>
> Signed-off-by: Kefeng Wang <redacted>
> ---
> v2:
> -i386 can't enable ZONE_DMA32, fix it.
> -make ZONE_DMA default y on X86 as before.
> -collect ACKs
>
>  arch/alpha/Kconfig                     |  5 +----
>  arch/arm/Kconfig                       |  3 ---
>  arch/arm64/Kconfig                     |  9 +--------
>  arch/ia64/Kconfig                      |  4 +---
>  arch/m68k/Kconfig                      |  5 +----
>  arch/microblaze/Kconfig                |  4 +---
>  arch/mips/Kconfig                      |  7 -------
>  arch/powerpc/Kconfig                   |  4 ----
>  arch/powerpc/platforms/Kconfig.cputype |  1 +

Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)

cheers
```