Re: How to map high memory for block io

[Pierre Ossman <drzeus-list@drzeus.cx>]

Russell King wrote:
> On Thu, Mar 02, 2006 at 08:26:50AM +0100, Pierre Ossman wrote:
>   
>> Russell King wrote:
>>     
>>> Okay, I've hit this same problem (but in a slightly different way) with
>>> mmci.c.  The way I'm proposing to fix this for mmci is to introduce a
>>> new capability which says "clustering is supported by this driver."
>>>       
>> This will decrease performance more than necessary for drivers that can
>> do clustering, just not in highmem. So what about another flag that says
>> "highmem is supported by this driver"?
>>     
>
> I think you're asking Jens that question - I know of no way to tell
> the block layer that clustering is fine for normal but not highmem.
>
>   

That wasn't what I meant. What I was referring to was disabling highmem
altogether, the way that is done now through looking at the dma mask.

Rgds
Pierre