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

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Date:   Tue, 26 Mar 2019 15:24:11 -0400
From:   "Joel Fernandes (Google)" <joel@...lfernandes.org>
To:     linux-kernel@...r.kernel.org
Cc:     "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        byungchul.park@....com, Ingo Molnar <mingo@...hat.com>,
        Josh Triplett <josh@...htriplett.org>, kernel-team@...roid.com,
        Lai Jiangshan <jiangshanlai@...il.com>,
        linux-kselftest@...r.kernel.org,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        "Paul E. McKenney" <paulmck@...ux.ibm.com>,
        Peter Zijlstra <peterz@...radead.org>, rcu@...r.kernel.org,
        Shuah Khan <shuah@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Will Deacon <will.deacon@....com>
Subject: [PATCH v2 4/4] rcutorture: Add cpu0 to the set of CPUs to add jitter

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) <joel@...lfernandes.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