slub: Keep track of whether slub is on the per-node partial list

Now we rely on the "frozen" bit to see if we should manipulate the
slab->slab_list, which will be changed in the following patch.

Instead we introduce another way to keep track of whether slub is on
the per-node partial list, here we reuse the PG_workingset bit.

We have to use the atomic set_bit() and clear_bit() variants and change
slab_unlock() to bit_spin_unlock() because when cmpxchg is not available
and PG_lock is used, there may be concurrent operations on the two bits.
Thanks to Mark Brown for reporting a hang and testing of a previous
version where the non-atomic operations were used.

Suggested-by: Matthew Wilcox <[email protected]>
Signed-off-by: Chengming Zhou <[email protected]>
Reviewed-by: Vlastimil Babka <[email protected]>
Tested-by: Hyeonggon Yoo <[email protected]>
Reviewed-by: Hyeonggon Yoo <[email protected]>
Signed-off-by: Vlastimil Babka <[email protected]>

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