Messages in this thread | | | From | Arnd Bergmann <> | Subject | Re: [patch 4/4] x86: allow CONFIG_ISA_DMA_API to be disabled | Date | Thu, 27 Jan 2011 09:23:37 +0100 |
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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
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