rcu: Explain why rcu_all_qs() is a stub in preemptible TREE RCU

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The cond_resched() function reports an RCU quiescent state only in
non-preemptible TREE RCU implementation.  This commit therefore adds a
comment explaining why cond_resched() does nothing in preemptible kernels.

Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Cc: Neeraj Upadhyay <neeraju@codeaurora.org>
Cc: Joel Fernandes <joel@joelfernandes.org>
Cc: Uladzislau Rezki <urezki@gmail.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

...

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Frederic Weisbecker 2021-07-06 01:43:43 +02:00 • committed by Paul E. McKenney

parent 8211e922de

commit 508958259b

1 changed files with 11 additions and 0 deletions

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kernel/sched/core.c

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