[PREEMPT RT] SLUB and split softirq lock for v3.4-rt

[Sebastian Andrzej Siewior]

3.4-rt which lacks two RT features from 3.6: SLUB support and the
split softirq lock implementation.

SLUB has a way better performance than SLAB on RT and the split
softirq lock implementation is necessary especially for realtime
networking applications.

The following patch series backports these features to 3.4-rt.

Steven, could you please apply these patches to a separate
3.4-rt-features branch?

Sebastian
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