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SubjectRe: amd64 questions
On Sun, Apr 11, 2004 at 01:37:46PM +0200, Paul Wagland wrote:
> On Apr 10, 2004, at 21:02, Hugo Mills wrote:
> >On Sat, Apr 10, 2004 at 08:49:04PM +0200, Andi Kleen wrote:
> >>>line either? Or we can if we use AMD64 [DM] libraries with a AMD64
> >>>kernel? DM = Device Mapper right?
> >>
> >>You can't use Device Mapper with 32bit user tools on a 64bit kernel
> >>right now.
> >
> > Well, you can, because that's what I'm doing on this machine. Joe
> >Thornber posted a patch[1] here a few weeks ago which fixes the
> >problem in a "sealing-wax-and-string" kind of way. It Works For
> >Me(tm), which is about all you can say about it -- it's not the
> >prettiest piece of code, even to my non-kernel eyes. :)
> Ah, yes, but you missed the bit slightly later in the thread where Andi
> requested that this not be added to the kernel since it would then
> break all currently existing 64bit DM user tools. Newly compiled ones
> would, of course, work, but you introduce a DM user tool versioning
> problem, where the old 64 bit utils need to be used with old kernels,
> and the new tools need to be used with the new kernels. As far as I
> understood, this is the "official" line for the mainstream kernel. It
> is my hope that the disties all decide to use Thornbers patch when they
> do release, but only time will tell...

Sorry, I probably wasn't making myself clear.

I'm well aware of the issues surrounding this patch, and the fact
that it's never going to get into mainline kernels. However, it _does_
allow you to use DM with 32-bit user-space + 64-bit kernel, which was
my only point.


=== Hugo Mills: hugo@... | | ===
PGP key: 1C335860 from or
--- The English language has the mot juste for every occasion. ---
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