Kefeng Wang [off-list 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