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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. However, experience indicates that sampling the CPU number in rcutorture's read-side code can reduce the probability of too-short bugs by a small integer factor. And small integer factors are crucial to RCU bug hunting, so this commit also introduces a default-off RCU_TORTURE_TEST_LOG_CPU Kconfig option to enable this CPU-number-logging functionality at build time. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>