additional RCU-induced staleness is generally not a problem.
However, there are many examples where stale data cannot be tolerated.
-One example in the Linux kernel is the System V IPC (see the ipc_lock()
-function in ipc/util.c). This code checks a *deleted* flag under a
+One example in the Linux kernel is the System V IPC (see the shm_lock()
+function in ipc/shm.c). This code checks a *deleted* flag under a
per-entry spinlock, and, if the *deleted* flag is set, pretends that the
entry does not exist. For this to be helpful, the search function must
-return holding the per-entry lock, as ipc_lock() does in fact do.
+return holding the per-entry spinlock, as shm_lock() does in fact do.
.. _quick_quiz: