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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2011-08-17 12:39:34 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2011-09-28 21:38:44 -0700
commit93898fb1a395d2a5a53db238c68036da2f8c64d1 (patch)
treebe5b53612cce334959a73617986ab9f3dc859c31 /kernel
parent5342e269b2b58ee0b0b4168a94087faaa60d0567 (diff)
downloadlwn-93898fb1a395d2a5a53db238c68036da2f8c64d1.tar.gz
lwn-93898fb1a395d2a5a53db238c68036da2f8c64d1.zip
rcu: Make rcu_torture_fqs() exit loops at end of test
The rcu_torture_fqs() function can prevent the rcutorture tests from completing, resulting in a hang. This commit therefore ensures that rcu_torture_fqs() will exit its inner loops at the end of the test, and also applies the newish ULONG_CMP_LT() macro to time comparisons. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/rcutorture.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/kernel/rcutorture.c b/kernel/rcutorture.c
index ade7771b208a..2431d576e9ca 100644
--- a/kernel/rcutorture.c
+++ b/kernel/rcutorture.c
@@ -741,7 +741,7 @@ static int rcu_torture_boost(void *arg)
do {
/* Wait for the next test interval. */
oldstarttime = boost_starttime;
- while (jiffies - oldstarttime > ULONG_MAX / 2) {
+ while (ULONG_CMP_LT(jiffies, oldstarttime)) {
schedule_timeout_uninterruptible(1);
rcu_stutter_wait("rcu_torture_boost");
if (kthread_should_stop() ||
@@ -752,7 +752,7 @@ static int rcu_torture_boost(void *arg)
/* Do one boost-test interval. */
endtime = oldstarttime + test_boost_duration * HZ;
call_rcu_time = jiffies;
- while (jiffies - endtime > ULONG_MAX / 2) {
+ while (ULONG_CMP_LT(jiffies, endtime)) {
/* If we don't have a callback in flight, post one. */
if (!rbi.inflight) {
smp_mb(); /* RCU core before ->inflight = 1. */
@@ -818,11 +818,13 @@ rcu_torture_fqs(void *arg)
VERBOSE_PRINTK_STRING("rcu_torture_fqs task started");
do {
fqs_resume_time = jiffies + fqs_stutter * HZ;
- while (jiffies - fqs_resume_time > LONG_MAX) {
+ while (ULONG_CMP_LT(jiffies, fqs_resume_time) &&
+ !kthread_should_stop()) {
schedule_timeout_interruptible(1);
}
fqs_burst_remaining = fqs_duration;
- while (fqs_burst_remaining > 0) {
+ while (fqs_burst_remaining > 0 &&
+ !kthread_should_stop()) {
cur_ops->fqs();
udelay(fqs_holdoff);
fqs_burst_remaining -= fqs_holdoff;