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

[Michael Ellerman]

Kefeng Wang <wangkefeng.wang at huawei.com> 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 at linux-foundation.org>
> Cc: Catalin Marinas <catalin.marinas at arm.com>
> Cc: Will Deacon <will at kernel.org>
> Cc: Geert Uytterhoeven <geert at linux-m68k.org>
> Cc: Thomas Bogendoerfer <tsbogend at alpha.franken.de>
> Cc: "David S. Miller" <davem at davemloft.net>
> Cc: Ingo Molnar <mingo at redhat.com>
> Cc: Borislav Petkov <bp at alien8.de>
> Cc: Palmer Dabbelt <palmer at dabbelt.com>
> Cc: Richard Henderson <rth at twiddle.net>
> Cc: Russell King <linux at armlinux.org.uk>
> Acked-by: Catalin Marinas <catalin.marinas at arm.com> # for arm64
> Acked-by: Geert Uytterhoeven <geert at linux-m68k.org> # for m68k
> Acked-by: Mike Rapoport <rppt at linux.ibm.com>
> Signed-off-by: Kefeng Wang <wangkefeng.wang at huawei.com>
> ---
> 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 at ellerman.id.au> (powerpc)

cheers