selftests/acct: share netlink helpers

Extract the duplicated generic netlink boilerplate (netlink_open,
send_request, get_family_id, and NLA walker macros) from cgroupstats.c and
taskstats_fill_stat

selftests/acct: share netlink helpers

Extract the duplicated generic netlink boilerplate (netlink_open,
send_request, get_family_id, and NLA walker macros) from cgroupstats.c and
taskstats_fill_stats_tgid.c into a shared netlink_helper.{h,c}.

Link: https://lore.kernel.org/a2adf27308b5cd90d50b59e8519b87da49486bee.1783876192.git.cyyzero16@gmail.com
Signed-off-by: Yiyang Chen <cyyzero16@gmail.com>
Suggested-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Balbir Singh <balbirs@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

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selftests/acct: add cgroupstats functional test

Add a self-contained test for the CGROUPSTATS_CMD_GET genl command that
covers three cases:

- querying a cgroup v1 hierarchy and verifying the respon

selftests/acct: add cgroupstats functional test

Add a self-contained test for the CGROUPSTATS_CMD_GET genl command that
covers three cases:

- querying a cgroup v1 hierarchy and verifying the response
contains non-zero task counts
- rejecting an invalid fd without NLM_F_ACK
- rejecting an invalid fd with NLM_F_ACK

Link: https://lore.kernel.org/2a56921276f0962f97f00863e8c7d3c3f6893d5a.1783713230.git.cyyzero16@gmail.com
Signed-off-by: Yiyang Chen <cyyzero16@gmail.com>
Cc: Balbir Singh <balbirs@nvidia.com>
Cc: Dr. Thomas Orgis <thomas.orgis@uni-hamburg.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

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