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rcu: Add READ_ONCE() to rcu_segcblist ->tails[]

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The rcu_segcblist structure's ->tails[] array entries are read
locklessly, so this commit adds the READ_ONCE() to a load in order to
avoid destructive compiler optimizations.

This data race was reported by KCSAN.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2020-01-03 16:14:08 -08:00
parent 0050c7b2d2
commit bfeebe2421
1 changed files with 1 additions and 1 deletions
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2
kernel/rcu/rcu_segcblist.c
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@ -182,7 +182,7 @@ void rcu_segcblist_offload(struct rcu_segcblist *rsclp)
bool rcu_segcblist_ready_cbs(struct rcu_segcblist *rsclp)
{
return rcu_segcblist_is_enabled(rsclp) &&
&rsclp->head != rsclp->tails[RCU_DONE_TAIL];
&rsclp->head != READ_ONCE(rsclp->tails[RCU_DONE_TAIL]);
}
/*