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In kernels built with CONFIG_PREEMPT_RT=n, spinlock critical sections are RCU readers because they disable preemption. However, they are also RCU readers in CONFIG_PREEMPT_RT=y because the -rt locking primitives contain rcu_read_lock() and rcu_read_unlock(). Therefore, upgrade rcu_dereference.rst to document this non-obvious case. Reported-by: Linus Torvalds <torvalds@linux-foundation.org> Closes: https://lore.kernel.org/lkml/CAHk-=whGKvjHCtJ6W4pQ0_h_k9fiFQ8V2GpM=BqYnB2X=SJ+XQ@mail.gmail.com/ Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Boqun Feng <boqun.feng@gmail.com> |
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| .. | ||
| Design | ||
| checklist.rst | ||
| index.rst | ||
| listRCU.rst | ||
| lockdep-splat.rst | ||
| lockdep.rst | ||
| NMI-RCU.rst | ||
| rcu_dereference.rst | ||
| rcu.rst | ||
| rcubarrier.rst | ||
| rculist_nulls.rst | ||
| rcuref.rst | ||
| RTFP.txt | ||
| stallwarn.rst | ||
| torture.rst | ||
| UP.rst | ||
| whatisRCU.rst | ||