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rcutorture: Use atomic increment for n_rcu_torture_timers

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Currently, rcu_torture_timer() relies on a lock to guard updates to
n_rcu_torture_timers.  Unfortunately, consolidating code with
rcu_torture_reader() will dispense with this lock.  This commit
therefore makes n_rcu_torture_timers be an atomic_long_t and uses
atomic_long_inc() to carry out the update.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2018-05-22 11:17:51 -07:00
parent 6b06aa723e
commit 8da9a59523
1 changed files with 3 additions and 3 deletions
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6
kernel/rcu/rcutorture.c
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@ -151,7 +151,7 @@ static long n_rcu_torture_boost_ktrerror;
static long n_rcu_torture_boost_rterror;
static long n_rcu_torture_boost_failure;
static long n_rcu_torture_boosts;
static long n_rcu_torture_timers;
static atomic_long_t n_rcu_torture_timers;
static long n_barrier_attempts;
static long n_barrier_successes;
static atomic_long_t n_cbfloods;
@ -1160,6 +1160,7 @@ static void rcu_torture_timer(struct timer_list *unused)
int pipe_count;
unsigned long long ts;
atomic_long_inc(&n_rcu_torture_timers);
idx = cur_ops->readlock();
started = cur_ops->get_gp_seq();
ts = rcu_trace_clock_local();
@ -1177,7 +1178,6 @@ static void rcu_torture_timer(struct timer_list *unused)
atomic_inc(&n_rcu_torture_mberror);
spin_lock(&rand_lock);
cur_ops->read_delay(&rand);
n_rcu_torture_timers++;
spin_unlock(&rand_lock);
preempt_disable();
pipe_count = p->rtort_pipe_count;
@ -1290,7 +1290,7 @@ rcu_torture_stats_print(void)
pr_cont("rtbf: %ld rtb: %ld nt: %ld ",
n_rcu_torture_boost_failure,
n_rcu_torture_boosts,
n_rcu_torture_timers);
atomic_long_read(&n_rcu_torture_timers));
torture_onoff_stats();
pr_cont("barrier: %ld/%ld:%ld ",
n_barrier_successes,