[PATCH 02/12] rcutorture: Make srcu_lockdep.sh check reader-conflict handling

[Joel Fernandes <joelagnelf@nvidia.com>]

From: "Paul E. McKenney" <paulmck@kernel.org>

Mixing different flavors of RCU readers is forbidden, for example, you
should not use srcu_read_lock() and srcu_read_lock_nmisafe() on the same
srcu_struct structure.  There are checks for this, but these checks are
not tested on a regular basis.  This commit therefore adds such tests
to srcu_lockdep.sh.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
---
 .../selftests/rcutorture/bin/srcu_lockdep.sh  | 31 +++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/tools/testing/selftests/rcutorture/bin/srcu_lockdep.sh b/tools/testing/selftests/rcutorture/bin/srcu_lockdep.sh
index b94f6d3445c6..208be7d09a61 100755
--- a/tools/testing/selftests/rcutorture/bin/srcu_lockdep.sh
+++ b/tools/testing/selftests/rcutorture/bin/srcu_lockdep.sh
@@ -79,6 +79,37 @@ do
 	done
 done
 
+# Test lockdep-enabled testing of mixed SRCU readers.
+for val in 0x1 0xf
+do
+	err=
+	tools/testing/selftests/rcutorture/bin/kvm.sh --allcpus --duration 5s --configs "SRCU-P" --kconfig "CONFIG_FORCE_NEED_SRCU_NMI_SAFE=y" --bootargs "rcutorture.reader_flavor=$val" --trust-make --datestamp "$ds/$val" > "$T/kvm.sh.out" 2>&1
+	ret=$?
+	mv "$T/kvm.sh.out" "$RCUTORTURE/res/$ds/$val"
+	if ! grep -q '^CONFIG_PROVE_LOCKING=y' .config
+	then
+		echo "rcu_torture_init_srcu_lockdep:Error: CONFIG_PROVE_LOCKING disabled in rcutorture SRCU-P scenario"
+		nerrs=$((nerrs+1))
+		err=1
+	fi
+	if test "$val" -eq 0xf && test "$ret" -eq 0
+	then
+		err=1
+		echo -n Unexpected success for > "$RCUTORTURE/res/$ds/$val/kvm.sh.err"
+	fi
+	if test "$val" -eq 0x1 && 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=$((nerrs+1))
+	fi
+done
+
 # Set up exit code.
 if test "$nerrs" -ne 0
 then
-- 
2.43.0