srcu: Early test SRCU polling start

Place an early call to start_poll_synchronize_srcu() before the invocation
of call_srcu() on the same srcu_struct structure.

After the later call to srcu_barrier(), the completion of the
first grace period should be visible to a subsequent invocation of
poll_state_synchronize_srcu(), and if not, warn.

Signed-off-by: Frederic Weisbecker <[email protected]>
Cc: Boqun Feng <[email protected]>
Cc: Lai Jiangshan <[email protected]>
Cc: Neeraj Upadhyay <[email protected]>
Cc: Josh Triplett <[email protected]>
Cc: Joel Fernandes <[email protected]>
Cc: Uladzislau Rezki <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>

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