Re: [PATCH 0/8] Create ZONE_MOVABLE to partition memory betweenmovable and non-movable pages
From: Christoph Lameter
Date: Mon Jan 29 2007 - 18:38:26 EST
On Mon, 29 Jan 2007, Russell King wrote:
> This sounds like it could help ARM where we have some weird DMA areas.
Some ARM platforms have no need for a ZONE_DMA. The code in mm allows you
to not compile ZONE_DMA support into these kernels.
> What will help even more is if the block layer can also be persuaded that
> a device dma mask is precisely that - a mask - and not a set of leading
> ones followed by a set of zeros, then we could eliminate the really ugly
> dmabounce code.
With a alloc_pages_range() one would be able to specify upper and lower
boundaries. The device dma mask can be translated to a fitting boundary.
Maybe we can then also get rid of the device mask and specify a boundary
there. There is a lot of ugly code all around that circumvents the
existing issues with dma masks. That would all go away.
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