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SubjectRe: [PATCH 5/5] powerpc: use asm-generic/dma-mapping-common.h
From
On Mon, 27 Jul 2009 16:08:46 -0500
Becky Bruce <beckyb@kernel.crashing.org> wrote:

>
> On Jul 23, 2009, at 10:24 PM, FUJITA Tomonori wrote:
>
> > Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
>
> Fujita,
>
> Since you're removing all the uses of it, you should probably remove
> PPC_NEED_DMA_SYNC_OPS from arch/powerpc/Kconfig:
>
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index 0603b6c..fb3f4ff 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -307,10 +307,6 @@ config SWIOTLB
> platforms where the size of a physical address is larger
> than the bus address. Not all platforms support this.
>
> -config PPC_NEED_DMA_SYNC_OPS
> - def_bool y
> - depends on (NOT_COHERENT_CACHE || SWIOTLB)
> -
> config HOTPLUG_CPU
> bool "Support for enabling/disabling CPUs"
> depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES ||
> PPC_PMAC)
>
> Otherwise, this looks good to me.

Ah, thanks. I fold the above change. The updated patchset is available
at:

git://git.kernel.org/pub/scm/linux/kernel/git/tomo/linux-2.6-misc.git powerpc


> I also think you want an ACK from Ben - making this switch does add
> slight overhead to platforms that don't need sync ops, but I think
> it's worth it. IIRC, it was Ben who asked for the optimization of
> NEED_DMA_SYNC_OPS, so I'd like him to weigh in here.

Yeah, of course. Ben?


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