Description: memcg: enable accounting for file lock caches
References:
 https://bugzilla.redhat.com/show_bug.cgi?id=2049700
 https://github.com/kata-containers/kata-containers/issues/3373
 https://lore.kernel.org/linux-mm/20210902215519.AWcuVc3li%25akpm@linux-foundation.org/
Notes:
Bugs:
upstream: released (5.15-rc1) [0f12156dff2862ac54235fc72703f18770769042]
5.10-upstream-stable: ignored "Minor issue"
4.19-upstream-stable: ignored "Minor issue"
4.9-upstream-stable: ignored "Minor issue"
sid: released (5.15.3-1)
5.10-bullseye-security: ignored "Minor issue"
4.19-buster-security: ignored "Minor issue"
4.9-stretch-security: ignored "Minor issue"