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

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: d89dffa976 ("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>
This commit is contained in:
Colin Ian King 2019-01-10 12:38:02 +00:00 committed by Shuah Khan
parent 3d244c192a
commit 2b531b6137
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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@ -37,6 +37,10 @@ prerequisite()
exit $ksft_skip
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`
@ -151,6 +155,8 @@ 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
@ -190,9 +196,10 @@ 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