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rcu: Add memory barriers

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Add the memory barriers added by e59fb3120b.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2011-05-16 02:24:04 -07:00
parent ba9f207c9f
commit 0bbcc529fc
1 changed files with 6 additions and 0 deletions
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6
kernel/rcutree.c
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@ -907,6 +907,12 @@ static void rcu_report_qs_rsp(struct rcu_state *rsp, unsigned long flags)
unsigned long gp_duration; unsigned long gp_duration;
WARN_ON_ONCE(!rcu_gp_in_progress(rsp)); 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; gp_duration = jiffies - rsp->gp_start;
if (gp_duration > rsp->gp_max) if (gp_duration > rsp->gp_max)
rsp->gp_max = gp_duration; rsp->gp_max = gp_duration;