ARM: enable interpreter, add locks code

[Andrew Haley]

Daniel Jacobowitz writes:
 > On Thu, Jul 12, 2007 at 02:08:23PM +0100, Andrew Haley wrote:
 > > Quite.  There are many things that we can worry about, but I'm quite
 > > happy to wait for this to be fixed by the LinuxThreads people.
 > 
 > It won't be, unfortunately.  LinuxThreads is dead and will not be
 > fixed.  NPTL, the replacement, gets to assume a sufficiently new
 > kernel version that it can call into the kernel for atomic operations
 > (there are helper functions at a magic location since around 2.6.15).

OK, so we should autoconf for the kernel version?  Something else?
I'm testing on 2.6.18-4.

Andrew.