Re: [BUILD FAILURE 01/04] Next June 04:PPC64 randconfig [drivers/staging/comedi/drivers.o]

[David Miller <davem@davemloft.net>]

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: Text/Plain; charset=utf-8, Size: 861 bytes --]

From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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.
ÿôèº{.nÇ+‰·Ÿ®‰­†+%ŠËÿ±éݶ\x17¥Šwÿº{.nÇ+‰·¥Š{±þG«éÿŠ{ayº\x1dʇڙë,j\a­¢f£¢·hšïêÿ‘êçz_è®\x03(­éšŽŠÝ¢j"ú\x1a¶^[m§ÿÿ¾\a«þG«éÿ¢¸?™¨è­Ú&£ø§~á¶iO•æ¬z·švØ^\x14\x04\x1a¶^[m§ÿÿÃ\fÿ¶ìÿ¢¸?–I¥