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>
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@ -1246,9 +1246,9 @@ static void record_gp_stall_check_time(struct rcu_state *rsp)
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unsigned long j1;
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rsp->gp_start = j;
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smp_wmb(); /* Record start time before stall time. */
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j1 = rcu_jiffies_till_stall_check();
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WRITE_ONCE(rsp->jiffies_stall, j + j1);
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/* Record ->gp_start before ->jiffies_stall. */
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smp_store_release(&rsp->jiffies_stall, j + j1); /* ^^^ */
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rsp->jiffies_resched = j + j1 / 2;
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rsp->n_force_qs_gpstart = READ_ONCE(rsp->n_force_qs);
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}
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