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selftests: cpu-hotplug: fix case where CPUs offline > CPUs present

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[ Upstream commit 2b531b6137834a55857a337ac17510d6436b6fbb ]

The cpu-hotplug test assumes that we can offline the maximum CPU as
described by /sys/devices/system/cpu/offline.  However, in the case
where the number of CPUs exceeds like kernel configuration then
the offline count can be greater than the present count and we end
up trying to test the offlining of a CPU that is not available to
offline.  Fix this by testing the maximum present CPU instead.

Also, the test currently offlines the CPU and does not online it,
so fix this by onlining the CPU after the test.

Fixes: d89dffa976bc ("fault-injection: add selftests for cpu and memory hotplug")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Shuah Khan <shuah@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Colin Ian King 2019-01-10 12:38:02 +00:00 committed by Greg Kroah-Hartman
parent 51cbb781d2
commit 33c6313f1e
1 changed files with 10 additions and 3 deletions
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13
tools/testing/selftests/cpu-hotplug/cpu-on-off-test.sh
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@ -35,6 +35,10 @@ prerequisite()
exit 0
fi
present_cpus=`cat $SYSFS/devices/system/cpu/present`
present_max=${present_cpus##*-}
echo "present_cpus = $present_cpus present_max = $present_max"
echo -e "\t Cpus in online state: $online_cpus"
offline_cpus=`cat $SYSFS/devices/system/cpu/offline`
@ -149,6 +153,8 @@ online_cpus=0
online_max=0
offline_cpus=0
offline_max=0
present_cpus=0
present_max=0
while getopts e:ahp: opt; do
case $opt in
@ -188,9 +194,10 @@ if [ $allcpus -eq 0 ]; then
online_cpu_expect_success $online_max
if [[ $offline_cpus -gt 0 ]]; then
echo -e "\t offline to online to offline: cpu $offline_max"
online_cpu_expect_success $offline_max
offline_cpu_expect_success $offline_max
echo -e "\t offline to online to offline: cpu $present_max"
online_cpu_expect_success $present_max
offline_cpu_expect_success $present_max
online_cpu $present_max
fi
exit 0
else