Confused. This patch has no effect.
Indeed, the three patches changing do_signal_stop() have no immediate
material effect. They all just clean up the code and prepare the hooks
that utrace (or something like it) needs to make tracing stops mesh well
with job control stops. I'd thought it
finish_utrace_stop() can check -stopped lockless. It was set by us,
we can't miss it.
We enter utrace_stop() for some stop. Either then or later, a group jctl
stop finishes and sets SIGNAL_STOP_STOPPED. Later, utrace_wakeup() sees
that and we switch to TASK_STOPPED after clearing -stopped.
get_utrace_lock() checks -state != EXIT_DEAD to make sure it safe
to use -utrace. This is unneeded since -utrace was embedded into
task_struct. If we can read -state, we can read -utrace as well.
I see. My immediate reaction to this was that it should have more comments
that make clear it's
