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Subject[pchecks v1 0/4] percpu v1: Implement Preemption checks for __this_cpu operations
This patchset introduces preemption checks for __this_cpu operations.

First we add new raw_cpu operations that perform this cpu operations
without preempt checks. Then we convert some uses in the core VM to
raw_cpu ops that would otherwise trigger after we add the preempt
checks.

The last patch then adds the preempt checks by modifying the
__this_cpu macros in include/linux/percpu.h




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