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rcu: Replace smp_wmb() with smp_store_release() for stall check 

This commit gets rid of the smp_wmb() in record_gp_stall_check_time()
in favor of an smp_store_release().

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
hifive-unleashed-5.1
Paul E. McKenney 2018-05-01 15:05:45 -07:00
parent 77cfc7bf24
commit 91f63ced7d
1 changed files with 2 additions and 2 deletions
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4
kernel/rcu/tree.c
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@ -1246,9 +1246,9 @@ static void record_gp_stall_check_time(struct rcu_state *rsp)
unsigned long j1;
rsp->gp_start = j;
smp_wmb(); /* Record start time before stall time. */
j1 = rcu_jiffies_till_stall_check();
WRITE_ONCE(rsp->jiffies_stall, j + j1);
/* Record ->gp_start before ->jiffies_stall. */
smp_store_release(&rsp->jiffies_stall, j + j1); /* ^^^ */
rsp->jiffies_resched = j + j1 / 2;
rsp->n_force_qs_gpstart = READ_ONCE(rsp->n_force_qs);
}