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This commit adds reader-state debugging checks to a new function named rcutorture_one_extend_check(), which is invoked before and after setting new reader states by the existing rcutorture_one_extend() function. These checks have proven to be rather heavyweight, reducing reproduction rate of some failures by a factor of two. They are therefore hidden behind a new RCU_TORTURE_TEST_CHK_RDR_STATE Kconfig option. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Cc: Frederic Weisbecker <frederic@kernel.org> Tested-by: kernel test robot <oliver.sang@intel.com> Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>