sys_getsid: don't use ->nsproxy directly
With the new semantics of find_vpid() we don't need to play with ->nsproxy explicitely, _vxx() do the right things. Also s/tasklist/rcu/. Signed-off-by: NOleg Nesterov <oleg@tv-sign.ru> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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