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torture: Forgive -EBUSY from boottime CPU-hotplug operations

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During boot, CPU hotplug is often disabled, for example by PCI probing.
On large systems that take substantial time to boot, this can result
in spurious RCU_HOTPLUG errors.  This commit therefore forgives any
boottime -EBUSY CPU-hotplug failures by adjusting counters to pretend
that the corresponding attempt never happened.  A non-splat record
of the failed attempt is emitted to the console with the added string
"(-EBUSY forgiven during boot)".

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2019-12-05 10:49:11 -08:00
parent 435508095a
commit a59ee765a6
1 changed files with 18 additions and 4 deletions
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22
kernel/torture.c
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@ -84,6 +84,7 @@ bool torture_offline(int cpu, long *n_offl_attempts, long *n_offl_successes,
{
unsigned long delta;
int ret;
char *s;
unsigned long starttime;
if (!cpu_online(cpu) || !cpu_is_hotpluggable(cpu))
@ -99,10 +100,16 @@ bool torture_offline(int cpu, long *n_offl_attempts, long *n_offl_successes,
(*n_offl_attempts)++;
ret = cpu_down(cpu);
if (ret) {
s = "";
if (!rcu_inkernel_boot_has_ended() && ret == -EBUSY) {
// PCI probe frequently disables hotplug during boot.
(*n_offl_attempts)--;
s = " (-EBUSY forgiven during boot)";
}
if (verbose)
pr_alert("%s" TORTURE_FLAG
"torture_onoff task: offline %d failed: errno %d\n",
torture_type, cpu, ret);
"torture_onoff task: offline %d failed%s: errno %d\n",
torture_type, cpu, s, ret);
} else {
if (verbose > 1)
pr_alert("%s" TORTURE_FLAG
@ -137,6 +144,7 @@ bool torture_online(int cpu, long *n_onl_attempts, long *n_onl_successes,
{
unsigned long delta;
int ret;
char *s;
unsigned long starttime;
if (cpu_online(cpu) || !cpu_is_hotpluggable(cpu))
@ -150,10 +158,16 @@ bool torture_online(int cpu, long *n_onl_attempts, long *n_onl_successes,
(*n_onl_attempts)++;
ret = cpu_up(cpu);
if (ret) {
s = "";
if (!rcu_inkernel_boot_has_ended() && ret == -EBUSY) {
// PCI probe frequently disables hotplug during boot.
(*n_onl_attempts)--;
s = " (-EBUSY forgiven during boot)";
}
if (verbose)
pr_alert("%s" TORTURE_FLAG
"torture_onoff task: online %d failed: errno %d\n",
torture_type, cpu, ret);
"torture_onoff task: online %d failed%s: errno %d\n",
torture_type, cpu, s, ret);
} else {
if (verbose > 1)
pr_alert("%s" TORTURE_FLAG