From 24aca4aea4f0179e0e56cf9ec610c27d07702945 Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Tue, 22 Jan 2019 19:23:00 -0800 Subject: torture: Don't try to offline the last CPU If there is only one online CPU, it doesn't make sense to try to offline it, as any such attempt is guaranteed to fail. This commit therefore check for this condition and refuses to attempt the nonsensical. Reported-by: Su Yue Signed-off-by: Paul E. McKenney Tested-By: Su Yue --- kernel/torture.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'kernel/torture.c') diff --git a/kernel/torture.c b/kernel/torture.c index 8faa1a9aaeb9..17b2be9bde12 100644 --- a/kernel/torture.c +++ b/kernel/torture.c @@ -88,6 +88,8 @@ bool torture_offline(int cpu, long *n_offl_attempts, long *n_offl_successes, if (!cpu_online(cpu) || !cpu_is_hotpluggable(cpu)) return false; + if (num_online_cpus() <= 1) + return false; /* Can't offline the last CPU. */ if (verbose > 1) pr_alert("%s" TORTURE_FLAG -- cgit v1.2.3-59-g8ed1b