PPC64 & DMA zone

[Tabi Timur-B04825]

On Fri, Aug 17, 2012 at 3:40 PM, Benjamin Herrenschmidt
<benh at kernel.crashing.org> wrote:
> On Fri, 2012-08-17 at 23:04 +0300, Aaro Koskinen wrote:
>> Hi,
>>
>> Is there a way to reduce/limit DMA zone with PPC64 kernel (3.6-rcX)
>> on G5 Mac? I have tried to search Kconfig or command line options,
>> but can't find anything.
>
> No.

What about Shaohui patches for ZONE_DMA?  That's meant to solve
exactly this problem?  Granted, it sets the DMA zone to 31 bits, but
it's simple to hack that to 30 bits.

-- 
Timur Tabi
Linux kernel developer at Freescale