tree 63afd141fdb380c7b00a01a2080ace6bcc232386
parent 755e276b3326f300585435d2f3876e66e248c476
author Tejun Heo <tj@kernel.org> 1307006039 +0200
committer Oleg Nesterov <oleg@redhat.com> 1307204230 +0200

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>