Re: [PATCH 00/15] Rework tty audit

Hi Greg, This patch series overhauls tty audit support. The goal was to simplify and speed up tty auditing, which was a significant performance hit even when disabled. The main features of this series are: * Remove reference counting; the purpose of reference counting the per- process tty_audit_buf was to prevent premature deletion if the buffer was in-use when tty auditing was exited for the process. However, since the process is single-threaded at tty_audit_exit(), the buffer cannot be in-use by another thread. Patch 11/15. * Remove functionally dead code, such as tty_put_user(). Patch 2/15. * Atomically modify tty audit enable/disable flags to support lockless read. Patch 9/15. Cc: Ingo Molnar <mingo(a)redhat.com&gt; Cc: Peter Zijlstra <peterz(a)infradead.org&gt; for patch 9/15 which removes an audit field from the signal_struct. Cc: Oleg Nesterov <oleg(a)redhat.com&gt; to confirm my understanding of the single-threadedness of if (group_dead) tty_audit_exit(), called from do_exit(). Patch 11/15 Requires: "tty: audit: Fix audit source"