FIX [0/2] Slub hot path fixes

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These are patches to fix up the issues brought up by Steven Rostedt.

I hoped to avoid the preempt disable for the tid retrieval but there is
no per cpu atomic way to get a value from the per cpu area and also retrieve
the pointer used in that operation. The pointer is necessary to fetch the
related data from the per cpu structure. Without that we
run into more issues with page pointer checks that can cause
freelist corruption in slab_free().

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