Re: [patch 4/4] x86: allow CONFIG_ISA_DMA_API to be disabled

[Arnd Bergmann]

On Thursday 27 January 2011 04:14:54 David Rientjes wrote:
> 
> Not all 64-bit systems require ISA-style DMA, so allow it to be
> configurable.  x86 utilizes the generic ISA DMA allocator from
> kernel/dma.c, so require it only when CONFIG_ISA_DMA_API is enabled.
> 
> Disabling CONFIG_ISA_DMA_API is dependent on x86_64 since those machines
> do not have ISA slots and benefit the most from disabling the option (and
> on CONFIG_EXPERT as required by H. Peter Anvin).

But the x86_64 machines can also run 32 bit kernel, and I would expect
that they don't need ISA DMA in that configuration either.

I think it would make sense to let the CONFIG_EXPERT user disable
DMA for 32 bit as well.

	Arnd
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/