From: Tejun Heo <tj@kernel.org>
Date: Thu, 2 Jun 2011 09:13:59 +0000 (+0200)
Subject: ptrace: relocate set_current_state(TASK_TRACED) in ptrace_stop()
X-Git-Tag: v3.1-rc1~308^2~35
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=81be24b8cdeb69e62f9d1b6b425fd9ffdd37f581;p=pandora-kernel.git

ptrace: relocate set_current_state(TASK_TRACED) in ptrace_stop()

In ptrace_stop(), after arch hook is done, the task state and jobctl
bits are updated while holding siglock.  The ordering requirement
there is that TASK_TRACED is set before JOBCTL_TRAPPING is cleared to
prevent ptracer waiting on TRAPPING doesn't end up waking up TRACED is
actually set and sees TASK_RUNNING in wait(2).

Move set_current_state(TASK_TRACED) to the top of the block and
reorganize comments.  This makes the ordering more obvious
(TASK_TRACED before other updates) and helps future updates to group
stop participation.

This patch doesn't cause any functional change.

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