rcutorture: Add srcu_lockdep.sh

This commit adds an srcu_lockdep.sh script that checks whether lockdep
correctly classifies SRCU-based, SRCU/mutex-based, and SRCU/rwsem-based
deadlocks.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
[ boqun: Fix "RCUTORTURE" with "$RCUTORTURE" ]
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>

tools/testing/selftests/rcutorture/bin/srcu_lockdep.sh

@@ -0,0 +1,78 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Run SRCU-lockdep tests and report any that fail to meet expectations.
+#
+# Copyright (C) 2021 Meta Platforms, Inc.
+#
+# Authors: Paul E. McKenney <paulmck@kernel.org>
+
+usage () {
+	echo "Usage: $scriptname optional arguments:"
+	echo "       --datestamp string"
+	exit 1
+}
+
+ds=`date +%Y.%m.%d-%H.%M.%S`-srcu_lockdep
+scriptname="$0"
+
+T="`mktemp -d ${TMPDIR-/tmp}/srcu_lockdep.sh.XXXXXX`"
+trap 'rm -rf $T' 0
+
+RCUTORTURE="`pwd`/tools/testing/selftests/rcutorture"; export RCUTORTURE
+PATH=${RCUTORTURE}/bin:$PATH; export PATH
+. functions.sh
+
+while test $# -gt 0
+do
+	case "$1" in
+	--datestamp)
+		checkarg --datestamp "(relative pathname)" "$#" "$2" '^[a-zA-Z0-9._/-]*$' '^--'
+		ds=$2
+		shift
+		;;
+	*)
+		echo Unknown argument $1
+		usage
+		;;
+	esac
+	shift
+done
+
+err=
+nerrs=0
+for d in 0 1
+do
+	for t in 0 1 2
+	do
+		for c in 1 2 3
+		do
+			err=
+			val=$((d*1000+t*10+c))
+			tools/testing/selftests/rcutorture/bin/kvm.sh --allcpus --duration 5s --configs "SRCU-P" --bootargs "rcutorture.test_srcu_lockdep=$val" --trust-make --datestamp "$ds/$val" > "$T/kvm.sh.out" 2>&1
+			ret=$?
+			mv "$T/kvm.sh.out" "$RCUTORTURE/res/$ds/$val"
+			if test "$d" -ne 0 && test "$ret" -eq 0
+			then
+				err=1
+				echo -n Unexpected success for > "$RCUTORTURE/res/$ds/$val/kvm.sh.err"
+			fi
+			if test "$d" -eq 0 && test "$ret" -ne 0
+			then
+				err=1
+				echo -n Unexpected failure for > "$RCUTORTURE/res/$ds/$val/kvm.sh.err"
+			fi
+			if test -n "$err"
+			then
+				grep "rcu_torture_init_srcu_lockdep: test_srcu_lockdep = " "$RCUTORTURE/res/$ds/$val/SRCU-P/console.log" | sed -e 's/^.*rcu_torture_init_srcu_lockdep://' >> "$RCUTORTURE/res/$ds/$val/kvm.sh.err"
+				cat "$RCUTORTURE/res/$ds/$val/kvm.sh.err"
+				nerrs=$((nerrs+1))
+			fi
+		done
+	done
+done
+if test "$nerrs" -ne 0
+then
+	exit 1
+fi
+exit 0