[PATCH,RFC] mmp clockevent handling race

[Lennert Buytenhek]

Hi!

The patch below has been sitting around in the OLPC XO-1.75 (MMP2-based
XO) bringup kernel tree for some time now, and upon recent rebasing of
this tree to 3.0, it was discovered that something like this patch is
still needed.

Symptoms: e.g. as described here: http://dev.laptop.org/ticket/10945
-- applications hang for a couple of minutes at a time, and sometimes
there are several-minute hangs during the boot process.