On Thu, 2011-08-25 at 20:49 +0200, Peter Zijlstra wrote:

the ARM LL/SC constraints pretty much mandate we do
preempt_disable()/preempt_enable() around them, 

My bad, that was MIPS, it states that portable programs should not issue
load/store/prefetch insn inside a LL/SC region or the behaviour is
undefined or somesuch.

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