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SubjectRe: [PATCH v2 tip/core/rcu 0/13] Miscellaneous fixes for 4.12

So the thing Maz complained about is because KVM assumes
synchronize_srcu() is 'free' when there is no srcu_read_lock() activity.
This series 'breaks' that.

I've not looked hard enough at the new SRCU to see if its possible to
re-instate that feature.

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