[PATCH 11/14] ARM: v6k: use CPU domain feature if we include support for arch < ARMv6K

Catalin Marinas catalin.marinas at arm.com
Fri Jan 28 08:10:56 EST 2011

On Fri, 2011-01-28 at 13:05 +0000, Russell King - ARM Linux wrote:
> On Fri, Jan 28, 2011 at 12:25:18PM +0000, Catalin Marinas wrote:
> > With your latest patches, do we use the TLS emulation on ARMv7 (UP) if
> > v6 is compiled in? If that's the case, we may have a problem - I talked
> > to the toolchain guys and it looks like code optimised for ARMv7 reads
> > the TLS register directly without going through the kuser helper.
> That's not a problem, because you wouldn't run ARMv7 optimized userspace
> on an ARMv6 CPU.  That's not what this whole exercise is about.

But you can run ARMv7 optimised userspace on ARMv7 CPU with a kernel
image compiled for v6+v7.


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