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| author |   Paul E. McKenney <paulmck@linux.ibm.com> | 2019-05-13 14:36:11 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.ibm.com> | 2019-08-13 14:35:49 -0700 |
| commit | 76c6927c3ee443e756f2c0c9f992cb04b26c65f2 (patch) | |
| tree | 68851e7d552137042cfb37a18713d753dbaa3e31 /kernel/rcu/rcu_segcblist.h | |
| parent | rcu/nocb: Remove deferred wakeup checks for extended quiescent states (diff) | |
| download | linux-dev-76c6927c3ee443e756f2c0c9f992cb04b26c65f2.tar.xz linux-dev-76c6927c3ee443e756f2c0c9f992cb04b26c65f2.zip | |
rcu/nocb: Allow lockless use of rcu_segcblist_restempty()
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>
Diffstat (limited to 'kernel/rcu/rcu_segcblist.h')
| -rw-r--r-- | kernel/rcu/rcu_segcblist.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/rcu/rcu_segcblist.h b/kernel/rcu/rcu_segcblist.h index 8f3783391075..f74960f0305c 100644 --- a/kernel/rcu/rcu_segcblist.h +++ b/kernel/rcu/rcu_segcblist.h @@ -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); |