Quoting Oren Laadan (orenl-eQaUEPhvms7ENvBUuze7eA@public.gmane.org):

Now we can do "external" checkpoint, i.e. act on another task.

sys_checkpoint() now looks up the target pid (in our namespace) and
checkpoints that corresponding task. That task should be the root of
a container.

sys_restart() remains the same, as the restart is always done in the
context of the restarting task.

Signed-off-by: Oren Laadan <redacted>

(Have looked this up and down, and it looks good, so while it's the
easiest piece of code to blame for the BUG() I'm getting, it doesn't
seem possible that it is)

Acked-by: Serge Hallyn <serue-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>

thanks, Oren.

-serge
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