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rcu/nocb: Allow lockless use of rcu_segcblist_restempty()

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Currently, rcu_segcblist_restempty() assumes that the callback list
is not being changed by other CPUs, but upcoming changes will require
it to operate locklessly.  This commit therefore adds the needed
READ_ONCE() calls, along with the WRITE_ONCE() calls when updating
the callback list.

Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
This commit is contained in:
Paul E. McKenney
2019-05-13 14:36:11 -07:00
parent ca5c825808
commit 76c6927c3e
2 changed files with 16 additions and 16 deletions
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2
kernel/rcu/rcu_segcblist.h
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@@ -79,7 +79,7 @@ static inline bool rcu_segcblist_is_offloaded(struct rcu_segcblist *rsclp)
*/
static inline bool rcu_segcblist_restempty(struct rcu_segcblist *rsclp, int seg)
{
return !*rsclp->tails[seg];
return !READ_ONCE(*READ_ONCE(rsclp->tails[seg]));
}
void rcu_segcblist_init(struct rcu_segcblist *rsclp);