Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/tools/memory-model/scripts/initlitmushist.sh b/tools/memory-model/scripts/initlitmushist.sh
new file mode 100755
index 0000000..956b695
--- /dev/null
+++ b/tools/memory-model/scripts/initlitmushist.sh
@@ -0,0 +1,68 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Runs the C-language litmus tests matching the specified criteria.
+# Generates the output for each .litmus file into a corresponding
+# .litmus.out file, and does not judge the result.
+#
+# sh initlitmushist.sh
+#
+# Run from the Linux kernel tools/memory-model directory.
+# See scripts/parseargs.sh for list of arguments.
+#
+# This script can consume significant wallclock time and CPU, especially as
+# the value of --procs rises. On a four-core (eight hardware threads)
+# 2.5GHz x86 with a one-minute per-run timeout:
+#
+# --procs wallclock CPU timeouts tests
+# 1 0m11.241s 0m1.086s 0 19
+# 2 1m12.598s 2m8.459s 2 393
+# 3 1m30.007s 6m2.479s 4 2291
+# 4 3m26.042s 18m5.139s 9 3217
+# 5 4m26.661s 23m54.128s 13 3784
+# 6 4m41.900s 26m4.721s 13 4352
+# 7 5m51.463s 35m50.868s 13 4626
+# 8 10m5.235s 68m43.672s 34 5117
+# 9 15m57.80s 105m58.101s 69 5156
+# 10 16m14.13s 103m35.009s 69 5165
+# 20 27m48.55s 198m3.286s 156 5269
+#
+# Increasing the timeout on the 20-process run to five minutes increases
+# the runtime to about 90 minutes with the CPU time rising to about
+# 10 hours. On the other hand, it decreases the number of timeouts to 101.
+#
+# Note that there are historical tests for which herd7 will fail
+# completely, for example, litmus/manual/atomic/C-unlock-wait-00.litmus
+# contains a call to spin_unlock_wait(), which no longer exists in either
+# the kernel or LKMM.
+
+. scripts/parseargs.sh
+
+T=/tmp/initlitmushist.sh.$$
+trap 'rm -rf $T' 0
+mkdir $T
+
+if test -d litmus
+then
+ :
+else
+ git clone https://github.com/paulmckrcu/litmus
+ ( cd litmus; git checkout origin/master )
+fi
+
+# Create any new directories that have appeared in the github litmus
+# repo since the last run.
+if test "$LKMM_DESTDIR" != "."
+then
+ find litmus -type d -print |
+ ( cd "$LKMM_DESTDIR"; sed -e 's/^/mkdir -p /' | sh )
+fi
+
+# Create a list of the C-language litmus tests with no more than the
+# specified number of processes (per the --procs argument).
+find litmus -name '*.litmus' -exec grep -l -m 1 "^C " {} \; > $T/list-C
+xargs < $T/list-C -r grep -L "^P${LKMM_PROCS}" > $T/list-C-short
+
+scripts/runlitmushist.sh < $T/list-C-short
+
+exit 0