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A CLOCK algorithm is used in this LRU abstraction. This avoids
relinking list nodes, which would require a write lock protecting it.
None of the LRU methods are threadsafe; locking must be done at a
higher level.
Code that uses this new LRU will be introduced in the next 2 commits.
As such, this commit will cause "defined but not used" compiler warnings
that will be resolved by the next 2 commits.
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>