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

[Vitaly W. <vw...@ru...>]

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