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

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Message-ID: <Pine.LNX.4.61.0707041121290.31752@mtfhpc.demon.co.uk>
Date:	Wed, 4 Jul 2007 11:27:32 +0100 (BST)
From:	Mark Fortescue <mark@...hpc.demon.co.uk>
To:	David Woodhouse <dwmw2@...radead.org>
cc:	linux-mm@...ck.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: Re: [PATCH] Re: Sparc32: random invalid instruction occourances on
 sparc32 (sun4c)

Hi David,

Another related point that may also need to be considered is that I think 
I am correct in saying that on ARM and on the 64bit platforms, sizeof 
(unsigned long long) is 16 (128bits).

Should the RedZone words be specified as __u64 not the unsigned long long 
used or does the alignment need to be that of unsigned long long ?

Regards
 	Mark Fortescue.

  On Tue, 3 Jul 2007, David Woodhouse wrote:

> On Wed, 2007-07-04 at 04:27 +0100, Mark Fortescue wrote:
>> I tried the previous patch and it looks like it fixes the issue however
>> one of the test builds I did caused depmod to use up all available memory
>> (40M - kernel memory) before taking out the kernel with the oom killer.
>> At present, I do not know if it is a depmod issue or a kernel issue.
>> I will have to do some more tests later on to day.
>
> That's almost certain to be an unrelated issue.
>
>> I have looked at the latest patch below and am I am still not sure about
>> two areas. Please take a look at my offering based on your latest
>> patch (included here to it will probably get mangled).
>>
>> Note the change to lines 2178 to 2185. I have also changed/moved the
>> alignment of size (see lines 2197 to 2206) based on your changes.
>
> The first looks correct; well spotted. The second is just cosmetic but
> also seems correct. I might be inclined to make the #define
> 'RED_ZONE_ALIGN' and use it in the other places too.
>
> -- 
> dwmw2
>
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