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:	Tue, 20 May 2008 17:35:56 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	benh@...nel.crashing.org, Trent Piepho <tpiepho@...escale.com>,
	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [POWERPC] Improve (in|out)_beXX() asm code

Alan Cox wrote:
>> It looks like we rely on -fno-strict-aliasing to prevent reordering 
>> ordinary memory accesses (such as to DMA descriptors) past the I/O 
> 
> DMA descriptors in main memory are dependant on cache behaviour anyway
> and the dma_* operators should be the ones enforcing the needed behaviour.

What about memory obtained from dma_alloc_coherent()?  We still need a 
sync and a compiler barrier.  The current I/O accessors have the former, 
but not the latter.

-Scott
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ