rcu: Document reason for rcu_all_qs() call to preempt_disable()
Given that rcu_all_qs() is in non-preemptible kernels, why on earth should it invoke preempt_disable()? This commit adds the reason, which is to work nicely with debugging enabled in CONFIG_PREEMPT_COUNT=y kernels. Reported-by:Neeraj Upadhyay <quic_neeraju@quicinc.com> Reported-by:
Boqun Feng <boqun.feng@gmail.com> Reported-by:
Frederic Weisbecker <frederic@kernel.org> Signed-off-by:
Paul E. McKenney <paulmck@kernel.org>
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