rcutorture: Decorate failing reader segments with CPU ID

This commit adds CPU number to the "Failure/close-call rcutorture reader
segments" list printed at the end of an rcutorture run that had too-short
grace periods.  This information can help debugging interactions with
migration and CPU hotplug.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
1 file changed