rcu: Document reason for rcu_all_qs() call to preempt_disable()

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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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Paul E. McKenney 2022-08-03 08:48:12 -07:00

parent 6ca0292ccf

commit 089254fd38

1 changed files with 1 additions and 1 deletions

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kernel/rcu/tree_plugin.h

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