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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2011-05-16 02:24:04 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2011-05-26 09:42:20 -0700 |
| commit | 0bbcc529fcea9c7de5e2e7243f9913b8f7302a8c (patch) | |
| tree | 22403b7c9bf3b87818c3a8a606a1bc33dd12bd1a /kernel/rcutree.c | |
| parent | ba9f207c9f82115aba4ce04b22e0081af0ae300f (diff) | |
| download | lwn-0bbcc529fcea9c7de5e2e7243f9913b8f7302a8c.tar.gz lwn-0bbcc529fcea9c7de5e2e7243f9913b8f7302a8c.zip | |
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.c | 6 |
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; |