Commit 24aca4ae authored Jan 22, 2019 by Paul E. McKenney

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 <suy.fnst@cn.fujitsu.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
Tested-By: Su Yue <suy.fnst@cn.fujitsu.com>

parent 9e98c678

kernel/torture.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -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

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