PIDs Controller Limit

[Aleksa Sarai]

Does it make sense for the PIDs controller to allow a user to set a
limit of 0? Since we don't cancel attaches, a limit of 0 doesn't
affect anything (nothing stops attaches, and you need to have a
process in the PIDs cgroup in order for fork()s to be affected by the
limit). So I think that attempting to set pid.limit to 0 should return
an -EINVAL.

-- 
Aleksa Sarai (cyphar)
www.cyphar.com
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