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This commit adds writer-side testing of the polling grace-period API. One test verifies that the polling API sees a grace period caused by some other mechanism. Another test verifies that using the polling API to wait for a grace period does not result in too-short grace periods. A third test verifies that the polling API does not report completion within a read-side critical section. A fourth and final test verifies that the polling API does report completion given an intervening grace period. Link: https://lore.kernel.org/rcu/20201112201547.GF3365678@moria.home.lan/ Reported-by: Kent Overstreet <kent.overstreet@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>