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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>