From 28cf5952f56005325f269ccfe402a880cd741189 Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Tue, 21 Aug 2018 15:27:16 -0700 Subject: 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 --- kernel/torture.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'kernel/torture.c') 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; 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 = 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"); -- cgit v1.2.3