Commit-ID: 24aca4aea4f0179e0e56cf9ec610c27d07702945
Gitweb: https://git.kernel.org/tip/24aca4aea4f0179e0e56cf9ec610c27d07702945
Author: Paul E. McKenney <paulmck@xxxxxxxxxxxxx>
AuthorDate: Tue, 22 Jan 2019 19:23:00 -0800
Committer: Paul E. McKenney <paulmck@xxxxxxxxxxxxx>
CommitDate: Tue, 26 Mar 2019 14:42:53 -0700
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@xxxxxxxxxxxxxx>
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxx>
Tested-By: Su Yue <suy.fnst@xxxxxxxxxxxxxx>
---
kernel/torture.c | 2 ++
1 file changed, 2 insertions(+)
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
|