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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/tools/testing/selftests/rcutorture/bin/cpus2use.sh
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@@ -1,30 +1,29 @@
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 #!/bin/bash
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+# SPDX-License-Identifier: GPL-2.0+
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 #
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 # Get an estimate of how CPU-hoggy to be.
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 #
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 # Usage: cpus2use.sh
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 #
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-# This program is free software; you can redistribute it and/or modify
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-# it under the terms of the GNU General Public License as published by
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-# the Free Software Foundation; either version 2 of the License, or
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-# (at your option) any later version.
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-#
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-# This program is distributed in the hope that it will be useful,
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-# but WITHOUT ANY WARRANTY; without even the implied warranty of
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-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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-# GNU General Public License for more details.
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-#
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-# You should have received a copy of the GNU General Public License
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-# along with this program; if not, you can access it online at
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-# http://www.gnu.org/licenses/gpl-2.0.html.
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-#
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 # Copyright (C) IBM Corporation, 2013
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 #
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-# Authors: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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+# Authors: Paul E. McKenney <paulmck@linux.ibm.com>
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+if test -n "$TORTURE_ALLOTED_CPUS"
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+then
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+	echo $TORTURE_ALLOTED_CPUS
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+	exit 0
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+fi
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 ncpus=`grep '^processor' /proc/cpuinfo | wc -l`
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-idlecpus=`mpstat | tail -1 | \
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-	awk -v ncpus=$ncpus '{ print ncpus * ($7 + $NF) / 100 }'`
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+if mpstat -V > /dev/null 2>&1
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+then
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+	idlecpus=`mpstat | tail -1 | \
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+		awk -v ncpus=$ncpus '{ print ncpus * ($7 + $NF) / 100 }'`
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+else
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+	# No mpstat command, so use all available CPUs.
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+	echo The mpstat command is not available, so greedily using all CPUs.
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+	idlecpus=$ncpus
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+fi
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 awk -v ncpus=$ncpus -v idlecpus=$idlecpus < /dev/null '
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 BEGIN {
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 	cpus2use = idlecpus;