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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 05 Jun 2009 17:56:56 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	benh@...nel.crashing.org
Cc:	subrata@...ux.vnet.ibm.com, sachinp@...ux.vnet.ibm.com,
	sfr@...b.auug.org.au, greg@...ah.com, linux-kernel@...r.kernel.org,
	Linuxppc-dev@...abs.org, linux-next@...r.kernel.org,
	paulus@...ba.org, Geert.Uytterhoeven@...ycom.com,
	geert@...ux-m68k.org
Subject: Re: [BUILD FAILURE 01/04] Next June 04:PPC64 randconfig
 [drivers/staging/comedi/drivers.o]

From: Benjamin Herrenschmidt <benh@...nel.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.