linux-kernel - [PATCH 1/2] selftest: don't offline the last CPU in cpu hotplug test

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Date:   Thu, 17 Dec 2020 23:34:32 +0800
From:   Lai Jiangshan <jiangshanlai@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Lai Jiangshan <laijs@...ux.alibaba.com>,
        Shuah Khan <shuah@...nel.org>, linux-kselftest@...r.kernel.org
Subject: [PATCH 1/2] selftest: don't offline the last CPU in cpu hotplug test

From: Lai Jiangshan <laijs@...ux.alibaba.com>

In my box, all CPUs are allowed to be offline.  The test tries to offline
all offline-able CPUs and causes fail on the last one.  We should just
skip offlining the last CPU

Signed-off-by: Lai Jiangshan <laijs@...ux.alibaba.com>
---
 tools/testing/selftests/cpu-hotplug/cpu-on-off-test.sh | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/testing/selftests/cpu-hotplug/cpu-on-off-test.sh b/tools/testing/selftests/cpu-hotplug/cpu-on-off-test.sh
index 0d26b5e3f966..5cdef96326a7 100755
--- a/tools/testing/selftests/cpu-hotplug/cpu-on-off-test.sh
+++ b/tools/testing/selftests/cpu-hotplug/cpu-on-off-test.sh
@@ -126,6 +126,11 @@ offline_cpu_expect_success()
 {
 	local cpu=$1
 
+	# don't offline the last CPU if all CPUs are offline-able
+	if [[ a$cpu = a`cat $SYSFS/devices/system/cpu/online` ]]; then
+		return
+	fi
+
 	if ! offline_cpu $cpu; then
 		echo $FUNCNAME $cpu: unexpected fail >&2
 		exit 1
-- 
2.19.1.6.gb485710b