[RFC 17/18] arm: mm: Add SW emulation for ARM domain manager feature

[Daniel Walker]

On Mon, 2010-03-22 at 14:58 -0400, Nicolas Pitre wrote:
> On Mon, 22 Mar 2010, Daniel Walker wrote:
> 
> > On Mon, 2010-01-25 at 16:40 +0000, Catalin Marinas wrote:
> > > Hi Daniel,
> > > 
> > > On Mon, 2010-01-11 at 22:47 +0000, Daniel Walker wrote:
> > > > Do not set domain manager bits in cp15 dacr.  Emulate using SW.  Add
> > > > kernel hooks to handle domain changes, permission faults, and context
> > > > switches.
> > > 
> > > In case you were not aware, there's a patch around (I think since 2007)
> > > that removes the domain switching entirely from the kernel (given that
> > > they have been deprecated for some time and may disappear completely in
> > > the future):
> > > 
> > > http://lists.infradead.org/pipermail/linux-arm-kernel/2009-December/005616.html
> > > 
> > 
> > I didn't find this in 2.6.34 ? Are you re-writing it? Why has it been
> > around so long out of mainline?
> 
> Because no real hardware out there needed it until recently, i.e. 
> inertia.

Current MSM hardware needs it, just to cover up a defect in the
processor. At least that's what this thread was originally about.

Daniel