change system file

hc

2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771

 kernel/tools/testing/selftests/rcutorture/bin/jitter.sh
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@@ -1,4 +1,5 @@
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 #!/bin/bash
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+# SPDX-License-Identifier: GPL-2.0+
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 #
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 # Alternate sleeping and spinning on randomly selected CPUs.  The purpose
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 # of this script is to inflict random OS jitter on a concurrently running
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@@ -11,23 +12,9 @@
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 # sleepmax: Maximum microseconds to sleep, defaults to one second.
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 # spinmax: Maximum microseconds to spin, defaults to one millisecond.
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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, 2016
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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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18
 
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 me=$(($1 * 1000))
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 duration=$2
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@@ -36,21 +23,46 @@
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 n=1
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-starttime=`awk 'BEGIN { print systime(); }' < /dev/null`
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+starttime=`gawk 'BEGIN { print systime(); }' < /dev/null`
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+
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+nohotplugcpus=
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+for i in /sys/devices/system/cpu/cpu[0-9]*
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+do
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+	if test -f $i/online
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+	then
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+		:
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+	else
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+		curcpu=`echo $i | sed -e 's/^[^0-9]*//'`
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+		nohotplugcpus="$nohotplugcpus $curcpu"
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+	fi
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+done
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 while :
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 do
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 	# Check for done.
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-	t=`awk -v s=$starttime 'BEGIN { print systime() - s; }' < /dev/null`
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+	t=`gawk -v s=$starttime 'BEGIN { print systime() - s; }' < /dev/null`
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 	if test "$t" -gt "$duration"
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 	then
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 		exit 0;
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 	fi
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-	# Set affinity to randomly selected CPU
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-	cpus=`ls /sys/devices/system/cpu/*/online |
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-		sed -e 's,/[^/]*$,,' -e 's/^[^0-9]*//' |
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-		grep -v '^0*$'`
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+	# Check for stop request.
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+	if test -f "$TORTURE_STOPFILE"
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+	then
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+		exit 1;
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+	fi
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+
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+	# Set affinity to randomly selected online CPU
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+	if cpus=`grep 1 /sys/devices/system/cpu/*/online 2>&1 |
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+		 sed -e 's,/[^/]*$,,' -e 's/^[^0-9]*//'`
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+	then
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+		:
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+	else
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+		cpus=
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+	fi
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+	# Do not leave out non-hot-pluggable CPUs
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+	cpus="$cpus $nohotplugcpus"
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+
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 	cpumask=`awk -v cpus="$cpus" -v me=$me -v n=$n 'BEGIN {
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 		srand(n + me + systime());
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 		ncpus = split(cpus, ca);