[RFC PATCH 0/12 v2] ptrace: introduce task_struct->ptrace_cxt

[Oleg Nesterov]

Changes:

	- renames as Ingo suggested

	- use task_lock() instead of cmpxchg() in _alloc()

	- comments update

New patches: move last_siginfo, ptrace_message, ptrace_entry.

Oleg.

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