[PATCH] arm64: smp: Add a memory barrier before we start secondary cores

[Mark Brown]

On Wed, Feb 12, 2014 at 01:43:32PM +0000, Catalin Marinas wrote:

> I think we can drop this until Vincent clarifies the synchronisation
> requirements (still wondering whether spinlocks are needed).

Even if they're not actually required for the topology code the fact
that we're having to think about what is needed suggests that the code
is going to end up being clearer and hence more maintainable going
forwards if we add it.
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