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

[Catalin Marinas]

On Thu, May 27, 2021 at 10:30:47PM +0800, Kefeng Wang wrote:
> 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>
> Signed-off-by: Kefeng Wang <wangkefeng.wang at huawei.com>

For arm64:

Acked-by: Catalin Marinas <catalin.marinas at arm.com>