[PATCH REPOST 0/2] signal: Avoid preempt_disable() in ptrace_stop() on PREEMPT_RT

[Sebastian Andrzej Siewior]

this mini series updates the comment to properly explain why the
preempt-disable section has been added and then disables this on
PREEMPT_RT explaining why it can not be done.

This is a repost of
	https://lore.kernel.org/20230406205713.1843072-1-bigeasy@xxxxxxxxxxxxx

Sebastian