Merge branch 'bpf-fd-array-release'

Daniel Borkmann says:

====================
bpf: improve fd array release

This set improves BPF perf fd array map release wrt to purging
entries, first two extend the API as needed. Please see individual
patches for more details.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>