rcu: Mark accesses to rdp->rcu_cpu_has_work

Although the rdp->rcu_cpu_has_work field is accessed only by the
corresponding CPU, it can be accessed by both interrupt handlers via
invoke_rcu_core_kthread() and at task level via rcu_cpu_kthread().
This means that we need this_cpu_read() rather than __this_cpu_read(),
this_cpu_write() rather than __this_cpu_write(), and READ_ONCE()
rather than plain C-language loads.  The exception is the boot-time
rcu_spawn_core_kthreads(), which cannot race with kthreads that have
not yet been spawned.

This commit therefore makes it so.

KCSAN located this issue.

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

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