[PATCH 0/3] ptrace_reparented fixes/cleanups

[Oleg Nesterov]

Hello.

Another thing I wanted to cleanup for so long time.

ptrace_reparented() is wrong. Now we have real_parent_is_ptracer()
which does the right thing, but the name is ugky and it is not
exported.

Fix ptrace_reparented() and kill the recently added
real_parent_is_ptracer().

Oleg.

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