Re: [PATCH/RFC] SPI: add DMAUNSAFE analog to David Brownell's core

[Vitaly Wool]

Greg KH wrote:

> On Wed, Dec 14, 2005 at 08:53:54PM +0300, Vitaly Wool wrote:
>  
>
> > Greg KH wrote:
> >
> >    
> >
> > > What is the speed of your SPI bus?
> > >
> > > And what are your preformance requirements?
> > >
> > >
> > >      
> > The maximum frequency for the SPI bus is 26 MHz, WLAN driver is to work 
> > at true 10 Mbit/sec.
> >    
>
> Then you should be fine with the copying data and memset stuff, based on
> the workload the rest of the kernel does for other busses which have
> this same requirement of DMAable buffers.
>
> And I'm sure David will be glad to have you point out any places in his
> code where it accidentally takes data off of the stack instead of
> allocating it.
>  
Hmm, I recall I've already posted some pieces of code with that stuff.

Vitaly

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