Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/tools/memory-model/scripts/checklitmus.sh b/tools/memory-model/scripts/checklitmus.sh
index bf12a75..11461ed 100755
--- a/tools/memory-model/scripts/checklitmus.sh
+++ b/tools/memory-model/scripts/checklitmus.sh
@@ -1,40 +1,24 @@
 #!/bin/sh
+# SPDX-License-Identifier: GPL-2.0+
 #
-# Run a herd test and check the result against a "Result:" comment within
-# the litmus test.  If the verification result does not match that specified
-# in the litmus test, this script prints an error message prefixed with
-# "^^^" and exits with a non-zero status.  It also outputs verification
+# Run a herd7 test and invokes judgelitmus.sh to check the result against
+# a "Result:" comment within the litmus test.  It also outputs verification
 # results to a file whose name is that of the specified litmus test, but
 # with ".out" appended.
 #
 # Usage:
 #	checklitmus.sh file.litmus
 #
-# The LINUX_HERD_OPTIONS environment variable may be used to specify
-# arguments to herd, which default to "-conf linux-kernel.cfg".  Thus,
-# one would normally run this in the directory containing the memory model,
-# specifying the pathname of the litmus test to check.
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, you can access it online at
-# http://www.gnu.org/licenses/gpl-2.0.html.
+# Run this in the directory containing the memory model, specifying the
+# pathname of the litmus test to check.  The caller is expected to have
+# properly set up the LKMM environment variables.
 #
 # Copyright IBM Corporation, 2018
 #
 # Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
 
 litmus=$1
-herdoptions=${LINUX_HERD_OPTIONS--conf linux-kernel.cfg}
+herdoptions=${LKMM_HERD_OPTIONS--conf linux-kernel.cfg}
 
 if test -f "$litmus" -a -r "$litmus"
 then
@@ -43,44 +27,8 @@
 	echo ' --- ' error: \"$litmus\" is not a readable file
 	exit 255
 fi
-if grep -q '^ \* Result: ' $litmus
-then
-	outcome=`grep -m 1 '^ \* Result: ' $litmus | awk '{ print $3 }'`
-else
-	outcome=specified
-fi
 
-echo Herd options: $herdoptions > $litmus.out
-/usr/bin/time herd7 -o ~/tmp $herdoptions $litmus >> $litmus.out 2>&1
-grep "Herd options:" $litmus.out
-grep '^Observation' $litmus.out
-if grep -q '^Observation' $litmus.out
-then
-	:
-else
-	cat $litmus.out
-	echo ' ^^^ Verification error'
-	echo ' ^^^ Verification error' >> $litmus.out 2>&1
-	exit 255
-fi
-if test "$outcome" = DEADLOCK
-then
-	echo grep 3 and 4
-	if grep '^Observation' $litmus.out | grep -q 'Never 0 0$'
-	then
-		ret=0
-	else
-		echo " ^^^ Unexpected non-$outcome verification"
-		echo " ^^^ Unexpected non-$outcome verification" >> $litmus.out 2>&1
-		ret=1
-	fi
-elif grep '^Observation' $litmus.out | grep -q $outcome || test "$outcome" = Maybe
-then
-	ret=0
-else
-	echo " ^^^ Unexpected non-$outcome verification"
-	echo " ^^^ Unexpected non-$outcome verification" >> $litmus.out 2>&1
-	ret=1
-fi
-tail -2 $litmus.out | head -1
-exit $ret
+echo Herd options: $herdoptions > $LKMM_DESTDIR/$litmus.out
+/usr/bin/time $LKMM_TIMEOUT_CMD herd7 $herdoptions $litmus >> $LKMM_DESTDIR/$litmus.out 2>&1
+
+scripts/judgelitmus.sh $litmus