> The vsyscall trick is a good one, and works with/without MMU, and
> with/without permission to disable interrupts in userspace.  

Unfortunately I don't find something about the "vsyscall trick" in the
Kernel sources not in the glibC sources. But I don't have found the
glibC sources for ARM yet, nor other hints on doing atomic operation
with the help of the vsyscall page (that is described as a memory area
that all processes can access, so it seems atomic operations are
required here, not provided).

I'd be happy if you could give some more pointers.

-Michael

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