Re: [PATCH v2] mm: generalize ZONE_[DMA|DMA32]

From: Michael Ellerman (mpe@xxxxxxxxxxxxxx)
Date: Mon May 31 2021 - 22:56:32 EST


Kefeng Wang <wangkefeng.wang@xxxxxxxxxx> 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@xxxxxxxxxxxxxxxxxxxx>
> Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
> Cc: Will Deacon <will@xxxxxxxxxx>
> Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
> Cc: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
> Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
> Cc: Ingo Molnar <mingo@xxxxxxxxxx>
> Cc: Borislav Petkov <bp@xxxxxxxxx>
> Cc: Palmer Dabbelt <palmer@xxxxxxxxxxx>
> Cc: Richard Henderson <rth@xxxxxxxxxxx>
> Cc: Russell King <linux@xxxxxxxxxxxxxxx>
> Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx> # for arm64
> Acked-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> # for m68k
> Acked-by: Mike Rapoport <rppt@xxxxxxxxxxxxx>
> Signed-off-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
> ---
> 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@xxxxxxxxxxxxxx> (powerpc)

cheers