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rcu/nocb: Use separate flag to indicate disabled ->cblist

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NULLing the RCU_NEXT_TAIL pointer was a clever way to save a byte, but
forward-progress considerations would require that this pointer be both
NULL and non-NULL, which, absent a quantum-computer port of the Linux
kernel, simply won't happen.  This commit therefore creates as separate
->enabled flag to replace the current NULL checks.

[ paulmck: Add include files per 0day test robot and -next. ]
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
This commit is contained in:
Paul E. McKenney 2019-04-12 12:34:41 -07:00
parent 18cd8c93e6
commit 1bb5f9b95a
4 changed files with 8 additions and 3 deletions
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2
kernel/rcu/tree_plugin.h
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@ -2189,8 +2189,8 @@ static bool init_nocb_callback_list(struct rcu_data *rdp)
rcu_segcblist_n_cbs(&rdp->cblist));
atomic_long_set(&rdp->nocb_q_count_lazy,
rcu_segcblist_n_lazy_cbs(&rdp->cblist));
rcu_segcblist_init(&rdp->cblist);
}
rcu_segcblist_init(&rdp->cblist);
rcu_segcblist_disable(&rdp->cblist);
return true;
}