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rcutorture: Prepare for asynchronous access to rcu_fwd_startat 

Because rcutorture's forward-progress checking will trigger from an
OOM notifier, this notifier will introduce asynchronous concurrent
access to the rcu_fwd_startat variable.  This commit therefore prepares
for this by converting updates to WRITE_ONCE().

Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
This commit is contained in:
Paul E. McKenney 2018-10-01 13:27:41 -07:00
parent 2a7d968816
commit 61670adcb4
1 changed files with 2 additions and 2 deletions
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4
kernel/rcu/rcutorture.c
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@ -1679,7 +1679,7 @@ static void rcu_torture_fwd_prog_nr(int *tested, int *tested_tries)
sd = cur_ops->stall_dur() + 1;
sd4 = (sd + fwd_progress_div - 1) / fwd_progress_div;
dur = sd4 + torture_random(&trs) % (sd - sd4);
rcu_fwd_startat = jiffies;
WRITE_ONCE(rcu_fwd_startat, jiffies);
stopat = rcu_fwd_startat + dur;
while (time_before(jiffies, stopat) && !torture_must_stop()) {
idx = cur_ops->readlock();
@ -1728,7 +1728,7 @@ static void rcu_torture_fwd_prog_cr(void)
/* Loop continuously posting RCU callbacks. */
WRITE_ONCE(rcu_fwd_cb_nodelay, true);
cur_ops->sync(); /* Later readers see above write. */
rcu_fwd_startat = jiffies;
WRITE_ONCE(rcu_fwd_startat, jiffies);
stopat = rcu_fwd_startat + MAX_FWD_CB_JIFFIES;
n_launders = 0;
n_launders_cb = 0;