From: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Date: Sat, 06 Jun 2009 09:32:29 +1000
>
>> I tried this. But, with some catch. ‘PAGE_KERNEL_NOCACHE’ seems to be the
>> choice for majority of architectures like frv, m32r, sh, x86, etc, as Geert
>> mentions below. However, i believe POWERPC defines it as ‘PAGE_KERNEL_NC‘
>> found at arch/powerpc/include/asm/pte-common.h.
>>
>> Paul/Banjamin,
>> Can you please confirm this ?
>
> Read my reply to Greg. Why the heck are you trying to map memory
> non-cacheable in the first place ?
I agree, this is extremely fishy.
I guess the issue is that the driver wants consistent DMA memory
but wants to allocate a huge area vmap() style.
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