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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2011-05-16 02:24:04 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2011-05-26 09:42:20 -0700
commit0bbcc529fcea9c7de5e2e7243f9913b8f7302a8c (patch)
tree22403b7c9bf3b87818c3a8a606a1bc33dd12bd1a /kernel/rcutree.c
parentba9f207c9f82115aba4ce04b22e0081af0ae300f (diff)
rcu: Add memory barriers
Add the memory barriers added by e59fb3120b. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcutree.c')
-rw-r--r--kernel/rcutree.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index e486f7c3ffb8..3731141d8ad7 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -907,6 +907,12 @@ static void rcu_report_qs_rsp(struct rcu_state *rsp, unsigned long flags)
unsigned long gp_duration;
WARN_ON_ONCE(!rcu_gp_in_progress(rsp));
+
+ /*
+ * Ensure that all grace-period and pre-grace-period activity
+ * is seen before the assignment to rsp->completed.
+ */
+ smp_mb(); /* See above block comment. */
gp_duration = jiffies - rsp->gp_start;
if (gp_duration > rsp->gp_max)
rsp->gp_max = gp_duration;