From: David Miller <davem@davemloft•net>
To: benh@kernel•crashing.org
Cc: subrata@linux•vnet.ibm.com, sachinp@linux•vnet.ibm.com,
sfr@canb•auug.org.au, greg@kroah•com,
linux-kernel@vger•kernel.org, Linuxppc-dev@ozlabs•org,
linux-next@vger•kernel.org, paulus@samba•org,
Geert.Uytterhoeven@sonycom•com, geert@linux-m68k•org
Subject: Re: [BUILD FAILURE 01/04] Next June 04:PPC64 randconfig [drivers/staging/comedi/drivers.o]
Date: Fri, 05 Jun 2009 17:56:56 -0700 (PDT) [thread overview]
Message-ID: <20090605.175656.95336229.davem@davemloft.net> (raw)
In-Reply-To: <1244244749.31984.16.camel@pasglop>
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.
next prev parent reply other threads:[~2009-06-06 0:56 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-05 18:26 [BUILD FAILURE 01/04] Next June 04:PPC64 randconfig [drivers/staging/comedi/drivers.o] Subrata Modak
2009-06-05 18:26 ` Greg KH
2009-06-05 23:31 ` Benjamin Herrenschmidt
2009-06-05 23:32 ` Benjamin Herrenschmidt
2009-06-06 0:56 ` David Miller [this message]
2009-06-06 4:16 ` Benjamin Herrenschmidt
2009-06-06 5:51 ` Greg KH
2009-06-06 13:36 ` Frank Mori Hess
2009-06-07 14:36 ` Subrata Modak
2009-06-09 3:50 ` Benjamin Herrenschmidt
2009-06-09 18:34 ` Subrata Modak
2009-06-09 18:54 ` Geert Uytterhoeven
2009-06-09 22:34 ` Benjamin Herrenschmidt
-- strict thread matches above, loose matches on Subject: below --
2009-06-04 13:31 Subrata Modak
2009-06-04 18:07 ` Greg KH
2009-06-04 20:40 ` Geert Uytterhoeven
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