linux-kernel - [PATCH] Re: Sparc32: random invalid instruction occourances on sparc32 (sun4c)

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Message-ID: <Pine.LNX.4.61.0707031910280.29930@mtfhpc.demon.co.uk>
Date:	Tue, 3 Jul 2007 19:57:24 +0100 (BST)
From:	Mark Fortescue <mark@...hpc.demon.co.uk>
To:	linux-mm@...ck.org
cc:	David Woodhouse <dwmw2@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, sparclinux@...r.kernel.org,
	David Miller <davem@...emloft.net>,
	Christoph Lameter <clameter@...r.sgi.com>,
	William Lee Irwin III <wli@...omorphy.com>
Subject: [PATCH] Re: Sparc32: random invalid instruction occourances on
 sparc32 (sun4c)

Hi all,

I have tested a solution to the random invalid instruction occourances on 
sparc32 (sun4c). I have attached the patch as my mail client messes up 
patch files.

The problem apears to be an alignment error of the redzone2 word, caused 
by the userword not being forced onto a 64bit boundary. My solution is to 
increase the size of the user word (BYTES_PER_WORD) to 64bits in order to 
force the correct alignment of the user word (and hence the redzone2 
word). My solution also works on platforms where sizeof(unsigned long 
long) is 128bits and requires 128bit alignment.

Regards
 	Mark Fortescue.

On Tue, 3 Jul 2007, Mark Fortescue wrote:

> Hi all,
>
> I think I have found the cause of the problem.
>
> Commit b46b8f19c9cd435ecac4d9d12b39d78c137ecd66 partially fixed alignment 
> issues but does not ensure that all 64bit alignment requirements of sparc32 
> are met. Tests have shown that the redzone2 word can become misallignd.
>
> I am currently working on a posible fix.
>
> Regards
> 	Mark Fortescue.
>
> On Tue, 3 Jul 2007, Michal Piotrowski wrote:
>
>> Hi all,
>> 
>> Here is a list of some known regressions in 2.6.22-rc7.
>> 
>> Feel free to add new regressions/remove fixed etc.
>> http://kernelnewbies.org/known_regressions
>> 
>> List of Aces
>> 
>> Name                    Regressions fixed since 21-Jun-2007
>> Hugh Dickins                           2
>> Andi Kleen                             1
>> Andrew Morton                          1
>> Benjamin Herrenschmidt                 1
>> Björn Steinbrink                       1
>> Bjorn Helgaas                          1
>> Jean Delvare                           1
>> Olaf Hering                            1
>> Siddha, Suresh B                       1
>> Trent Piepho                           1
>> Ville Syrjälä                          1
>> 
>> 
>> 
>> FS
>> 
>> Subject    : 2.6.22-rc4-git5 reiserfs: null ptr deref.
>> References : http://lkml.org/lkml/2007/6/13/322
>> Submitter  : Randy Dunlap <randy.dunlap@...cle.com>
>> Handled-By : Vladimir V. Saveliev <vs@...esys.com>
>> Status     : problem is being debugged
>> 
>> 
>> 
>> IDE
>> 
>> Subject    : 2.6.22-rcX: hda: lost interrupt
>> References : http://lkml.org/lkml/2007/6/29/121
>> Submitter  : David Chinner <dgc@....com>
>> Status     : unknown
>> 
>> 
>> 
>> Sparc64
>> 
>> Subject    : random invalid instruction occourances on sparc32 (sun4c)
>> References : http://lkml.org/lkml/2007/6/17/111
>> Submitter  : Mark Fortescue <mark@...hpc.demon.co.uk>
>> Status     : problem is being debugged
>> 
>> Subject    : 2.6.22-rc broke X on Ultra5
>> References : http://lkml.org/lkml/2007/5/22/78
>> Submitter  : Mikael Pettersson <mikpe@...uu.se>
>> Handled-By : David Miller <davem@...emloft.net>
>> Status     : problem is being debugged
>> 
>> 
>> 
>> Regards,
>> Michal
>> 
>> --
>> LOG
>> http://www.stardust.webpages.pl/log/
>> -
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>
View attachment "slab_fix.patch" of type "TEXT/PLAIN" (2480 bytes)