Android and compatibility with deprecated armv7 instructions

[Grant Likely]

On Thu, 3 Jul 2014 18:13:56 +0100, Catalin Marinas <catalin.marinas at arm.com> wrote:
> On Thu, Jul 03, 2014 at 04:00:08PM +0100, Russell King - ARM Linux wrote:
> > We can have that on ARM, but only for userspace.  The difference is
> > that the kernel has to do the backwards compatibility rather than the
> > (nonexistent) CPU microcode - and we do have that capability for SWP.
> > 
> > We may not find it desirable to do it for ARMv8, but _if_ we wish to
> > allow users to migrate... if we wish to allow the existing set of
> > userspace programs (some of which may be statically linked to their
> > C library) to continue to work, there's only one option here.
> > 
> > While I can understand ARM Ltd
> 
> Please don't generalise to ARM Ltd here, even though Will and myself are
> employed by ARM. We try hard to separate the kernel maintenance
> decisions from the ARM (management) ones (in this instance, they may
> actually differ).

In case it gets lost in the heat of this debate, I have certainly
noticed that you do so and I truly appreciate it. Well done.

g.