From: Oleg Nesterov <oleg@redhat.com>
Date: Wed, 22 Jun 2011 21:10:26 +0000 (+0200)
Subject: redefine thread_group_leader() as exit_signal >= 0
X-Git-Tag: v3.1-rc1~308^2~11
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=087806b1281563e4ae7a5bce3155f894af5f4118;p=pandora-kernel.git

redefine thread_group_leader() as exit_signal >= 0

Change de_thread() to set old_leader->exit_signal = -1. This is
good for the consistency, it is no longer the leader and all
sub-threads have exit_signal = -1 set by copy_process(CLONE_THREAD).

And this allows us to micro-optimize thread_group_leader(), it can
simply check exit_signal >= 0. This also makes sense because we
should move ->group_leader from task_struct to signal_struct.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Tejun Heo <tj@kernel.org>
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