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Re: revivesa status 2008/07/09
On Thu, Jul 24, 2008 at 12:31:07PM +0200, Havard Eidnes wrote:
> > > Be able to run a netbsd-4 or netbsd-3 userland on a netbsd-5 kernel.
> > I've come to believe that the ABI contract we should provide is
> > between the apps and libc/libpthread, i.e. at the .so level. The
> > kernel to libc/libpthread interface should be allowed to be more fluid.
> > Yes, I know that this will upset people who like static libraries, but
> > frankly, I don't really care.
> That's not the only serious problem such a change would introduce.
> As far as I understand it, such a change would *in practice* force a
> synchronized upgrade of both kernel and user-land (mostly due to
> "dragged-along dependencies"), as exemplified by a transition from 4.0
> to -current, to preserve full functionality. This makes it cumbersome
> to say the least to back down of such an upgrade, if one were so
> inclined, something we've supported in the past by having the ABI
> contract between user-land and the kernel. I think "operator-friendly
> testing of new kernels" is a feature which is important to preserve.
Speaking personally, dropping in a new kernel is not something I would ever
do on a production system. Many things would break because the compatibility
that is provided is basic.
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