diff options
authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2018-08-21 15:27:16 -0700
committerPaul E. McKenney <paulmck@linux.ibm.com>2018-12-01 12:45:32 -0800
commit28cf5952f56005325f269ccfe402a880cd741189 (patch)
parent4871848531af1d62f30032bfb872c43b9afe03ad (diff)
torture: Bring any extra CPUs online during kernel startup
Currently, the torture scripts rely on the initrd/init script to bring any extra CPUs online, for example, in the case where the kernel and qemu have different ideas about how many CPUs are present. This works, but is an unnecessary dependency on initrd, which needs to vary depending on the distro. This commit therefore causes torture_onoff() to check for additional CPUs, attempting to bring any found online. Errors are ignored, just as they are by the initrd/init script. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
1 files changed, 12 insertions, 0 deletions
diff --git a/kernel/torture.c b/kernel/torture.c
index 17d91f5fba2a..9410d1bf84d6 100644
--- a/kernel/torture.c
+++ b/kernel/torture.c
@@ -194,11 +194,23 @@ torture_onoff(void *arg)
int cpu;
int maxcpu = -1;
+ int ret;
VERBOSE_TOROUT_STRING("torture_onoff task started");
maxcpu = cpu;
WARN_ON(maxcpu < 0);
+ for_each_possible_cpu(cpu) {
+ if (cpu_online(cpu))
+ continue;
+ ret = cpu_up(cpu);
+ if (ret && verbose) {
+ pr_alert("%s" TORTURE_FLAG
+ "%s: Initial online %d: errno %d\n",
+ __func__, torture_type, cpu, ret);
+ }
+ }
if (maxcpu == 0) {
VERBOSE_TOROUT_STRING("Only one CPU, so CPU-hotplug testing is disabled");

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