[RFC][PATCH] add dma_reserve_coherent_memory()/dma_free_reserved_memory() API

[FUJITA Tomonori]

On Thu, 26 Aug 2010 11:45:58 +0200 (CEST)
Guennadi Liakhovetski <g.liakhovetski at gmx.de> wrote:

> On Thu, 26 Aug 2010, FUJITA Tomonori wrote:
> 
> > Why can't you revert a commit that causes the regression?
> 
> See this reply, and the complete thread too.
> 
> http://marc.info/?l=linux-sh&m=128130485208262&w=2
> 
> > The related DMA API wasn't changed in 2.6.36-rc1. The DMA API is not
> > responsible for the regression. And the patchset even exnteds the
> > definition of the DMA API (dma_declare_coherent_memory). Such change
> > shouldn't applied after rc1. I think that DMA-API.txt says that
> > dma_declare_coherent_memory() handles coherent memory for a particular
> > device. It's not for the API that reserves coherent memory that can be
> > used for any device for a single device.
> 
> Anyway, we need a way to fix the regression.

Needs to find a different way.