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Re: ptrace induced instruction cache bug?

To: Nathan Field <ndf@ghs.com>
Subject: Re: ptrace induced instruction cache bug?
From: Jun Sun <jsun@mvista.com>
Date: Wed, 14 Jan 2004 16:40:11 -0800
Cc: Daniel Jacobowitz <dan@debian.org>, linux-mips@linux-mips.org, jsun@mvista.com
In-reply-to: <Pine.LNX.4.44.0401141619110.1969-100000@zcar.ghs.com>; from ndf@ghs.com on Wed, Jan 14, 2004 at 04:22:01PM -0800
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <20040114160729.D13471@mvista.com> <Pine.LNX.4.44.0401141619110.1969-100000@zcar.ghs.com>
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On Wed, Jan 14, 2004 at 04:22:01PM -0800, Nathan Field wrote:
> > There are too many things related to cache are wrong in 2.4.17.  For
> > example,
> > 
> > . flush_page_indexed() is not right for multi-way cache
> > . when you map user pages into kernel, you are sufferring potential cache
> >   aliasing problem (BTW, we still suffer from this right now to a less 
> > degree)
> > . flush_page_to_ram() has a broken semantic, because it is not clear whether
> >   the area mapped into user virt spaces should be flushed or not
> > ...
> > 
> > In short, it is not worth your time to fix old bugs.  Last time I
> > checked malta was working fine around 2.4.21.  It shouldn't be too hard
> > to get it working again in the latest 2.4 branch.
>       Is this the 2.4.21 from ftp.kernel.org, or do I need to get 
> specific patches to get it to work? I looked at the cvs tree but it's 
> currently a 2.6 release. Should I just check out the linux_2_4_branch 
> version from linux-mips.org?
> 

Yes.  "linux_2_4" branch to be exact.

Jun

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