[PATCH v2 4/4] rcutorture: Add cpu0 to the set of CPUs to add jitter

[Joel Fernandes (Google)]

jitter.sh currently does not add CPU0 to the list of CPUs for adding of
jitter. Let us add it to this list even when it is not hot-pluggable.

Signed-off-by: Joel Fernandes (Google) <j...@joelfernandes.org>
---
 tools/testing/selftests/rcutorture/bin/jitter.sh | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/rcutorture/bin/jitter.sh 
b/tools/testing/selftests/rcutorture/bin/jitter.sh
index 47bd9829dc55..26faf5824a1f 100755
--- a/tools/testing/selftests/rcutorture/bin/jitter.sh
+++ b/tools/testing/selftests/rcutorture/bin/jitter.sh
@@ -49,8 +49,12 @@ do
 
        # Set affinity to randomly selected online CPU
        cpus=`grep 1 /sys/devices/system/cpu/*/online |
-               sed -e 's,/[^/]*$,,' -e 's/^[^0-9]*//' |
-               grep -v '^0*$'`
+               sed -e 's,/[^/]*$,,' -e 's/^[^0-9]*//'`
+
+       # Do not leave out poor old cpu0 which may not be hot-pluggable
+       if [ ! -f "/sys/devices/system/cpu/cpu0/online" ]; then
+               cpus="0 $cpus"
+       fi
 
        cpumask=`awk -v cpus="$cpus" -v me=$me -v n=$n 'BEGIN {
                srand(n + me + systime());
-- 
2.21.0.392.gf8f6787159e-goog