On Mon, 22 Mar 2010, Daniel Walker wrote:

On Mon, 2010-03-22 at 14:58 -0400, Nicolas Pitre wrote:

quoted

On Mon, 22 Mar 2010, Daniel Walker wrote:

quoted

On Mon, 2010-01-25 at 16:40 +0000, Catalin Marinas wrote:

quoted

Hi Daniel,

On Mon, 2010-01-11 at 22:47 +0000, Daniel Walker wrote:

quoted

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.

Some other processors should need it too for some architecturally 
defined reasons. Would be a good thing if you could remove your 
emulation and replace it with this patch, and confirm it works for you 
by providing Tested-by tags.


Nicolas