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torture: Clean up after torture-test CPU hotplugging 

This commit puts all CPUs back online at the end of a torture test,
and also unconditionally puts them online at the beginning of the test,
rather than just in the case of built-in tests.  This allows torture tests
to behave in a predictable manner, whether built-in or based on modules.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
master
Paul E. McKenney 2020-12-19 07:05:58 -08:00
parent edf7b84178
commit 0b962c8fe0
1 changed files with 22 additions and 14 deletions
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36
kernel/torture.c
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@ -291,6 +291,26 @@ bool torture_online(int cpu, long *n_onl_attempts, long *n_onl_successes,
}
EXPORT_SYMBOL_GPL(torture_online);
/*
* Get everything online at the beginning and ends of tests.
*/
static void torture_online_all(char *phase)
{
int cpu;
int ret;
for_each_possible_cpu(cpu) {
if (cpu_online(cpu))
continue;
ret = add_cpu(cpu);
if (ret && verbose) {
pr_alert("%s" TORTURE_FLAG
"%s: %s online %d: errno %d\n",
__func__, phase, torture_type, cpu, ret);
}
}
}
/*
* Execute random CPU-hotplug operations at the interval specified
* by the onoff_interval.
@ -301,25 +321,12 @@ torture_onoff(void *arg)
int cpu;
int maxcpu = -1;
DEFINE_TORTURE_RANDOM(rand);
int ret;
VERBOSE_TOROUT_STRING("torture_onoff task started");
for_each_online_cpu(cpu)
maxcpu = cpu;
WARN_ON(maxcpu < 0);
if (!IS_MODULE(CONFIG_TORTURE_TEST)) {
for_each_possible_cpu(cpu) {
if (cpu_online(cpu))
continue;
ret = add_cpu(cpu);
if (ret && verbose) {
pr_alert("%s" TORTURE_FLAG
"%s: Initial online %d: errno %d\n",
__func__, torture_type, cpu, ret);
}
}
}
torture_online_all("Initial");
if (maxcpu == 0) {
VERBOSE_TOROUT_STRING("Only one CPU, so CPU-hotplug testing is disabled");
goto stop;
@ -347,6 +354,7 @@ torture_onoff(void *arg)
stop:
torture_kthread_stopping("torture_onoff");
torture_online_all("Final");
return 0;
}