[PATCH] lockdep: locking API self tests
Ingo Molnar [Mon, 3 Jul 2006 07:24:48 +0000 (00:24 -0700)]
Introduce DEBUG_LOCKING_API_SELFTESTS, which uses the generic lock debugging
code's silent-failure feature to run a matrix of testcases.  There are 210
testcases currently:

  +-----------------------
  | Locking API testsuite:
  +------------------------------+------+------+------+------+------+------+
                                 | spin |wlock |rlock |mutex | wsem | rsem |
  -------------------------------+------+------+------+------+------+------+
                     A-A deadlock:  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |
                 A-B-B-A deadlock:  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |
             A-B-B-C-C-A deadlock:  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |
             A-B-C-A-B-C deadlock:  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |
         A-B-B-C-C-D-D-A deadlock:  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |
         A-B-C-D-B-D-D-A deadlock:  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |
         A-B-C-D-B-C-D-A deadlock:  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |
                    double unlock:  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |
                 bad unlock order:  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |
  --------------------------------------+------+------+------+------+------+
              recursive read-lock:             |  ok  |             |  ok  |
  --------------------------------------+------+------+------+------+------+
                non-nested unlock:  ok  |  ok  |  ok  |  ok  |
  --------------------------------------+------+------+------+
     hard-irqs-on + irq-safe-A/12:  ok  |  ok  |  ok  |
     soft-irqs-on + irq-safe-A/12:  ok  |  ok  |  ok  |
     hard-irqs-on + irq-safe-A/21:  ok  |  ok  |  ok  |
     soft-irqs-on + irq-safe-A/21:  ok  |  ok  |  ok  |
       sirq-safe-A => hirqs-on/12:  ok  |  ok  |  ok  |
       sirq-safe-A => hirqs-on/21:  ok  |  ok  |  ok  |
         hard-safe-A + irqs-on/12:  ok  |  ok  |  ok  |
         soft-safe-A + irqs-on/12:  ok  |  ok  |  ok  |
         hard-safe-A + irqs-on/21:  ok  |  ok  |  ok  |
         soft-safe-A + irqs-on/21:  ok  |  ok  |  ok  |
    hard-safe-A + unsafe-B #1/123:  ok  |  ok  |  ok  |
    soft-safe-A + unsafe-B #1/123:  ok  |  ok  |  ok  |
    hard-safe-A + unsafe-B #1/132:  ok  |  ok  |  ok  |
    soft-safe-A + unsafe-B #1/132:  ok  |  ok  |  ok  |
    hard-safe-A + unsafe-B #1/213:  ok  |  ok  |  ok  |
    soft-safe-A + unsafe-B #1/213:  ok  |  ok  |  ok  |
    hard-safe-A + unsafe-B #1/231:  ok  |  ok  |  ok  |
    soft-safe-A + unsafe-B #1/231:  ok  |  ok  |  ok  |
    hard-safe-A + unsafe-B #1/312:  ok  |  ok  |  ok  |
    soft-safe-A + unsafe-B #1/312:  ok  |  ok  |  ok  |
    hard-safe-A + unsafe-B #1/321:  ok  |  ok  |  ok  |
    soft-safe-A + unsafe-B #1/321:  ok  |  ok  |  ok  |
    hard-safe-A + unsafe-B #2/123:  ok  |  ok  |  ok  |
    soft-safe-A + unsafe-B #2/123:  ok  |  ok  |  ok  |
    hard-safe-A + unsafe-B #2/132:  ok  |  ok  |  ok  |
    soft-safe-A + unsafe-B #2/132:  ok  |  ok  |  ok  |
    hard-safe-A + unsafe-B #2/213:  ok  |  ok  |  ok  |
    soft-safe-A + unsafe-B #2/213:  ok  |  ok  |  ok  |
    hard-safe-A + unsafe-B #2/231:  ok  |  ok  |  ok  |
    soft-safe-A + unsafe-B #2/231:  ok  |  ok  |  ok  |
    hard-safe-A + unsafe-B #2/312:  ok  |  ok  |  ok  |
    soft-safe-A + unsafe-B #2/312:  ok  |  ok  |  ok  |
    hard-safe-A + unsafe-B #2/321:  ok  |  ok  |  ok  |
    soft-safe-A + unsafe-B #2/321:  ok  |  ok  |  ok  |
      hard-irq lock-inversion/123:  ok  |  ok  |  ok  |
      soft-irq lock-inversion/123:  ok  |  ok  |  ok  |
      hard-irq lock-inversion/132:  ok  |  ok  |  ok  |
      soft-irq lock-inversion/132:  ok  |  ok  |  ok  |
      hard-irq lock-inversion/213:  ok  |  ok  |  ok  |
      soft-irq lock-inversion/213:  ok  |  ok  |  ok  |
      hard-irq lock-inversion/231:  ok  |  ok  |  ok  |
      soft-irq lock-inversion/231:  ok  |  ok  |  ok  |
      hard-irq lock-inversion/312:  ok  |  ok  |  ok  |
      soft-irq lock-inversion/312:  ok  |  ok  |  ok  |
      hard-irq lock-inversion/321:  ok  |  ok  |  ok  |
      soft-irq lock-inversion/321:  ok  |  ok  |  ok  |
      hard-irq read-recursion/123:  ok  |
      soft-irq read-recursion/123:  ok  |
      hard-irq read-recursion/132:  ok  |
      soft-irq read-recursion/132:  ok  |
      hard-irq read-recursion/213:  ok  |
      soft-irq read-recursion/213:  ok  |
      hard-irq read-recursion/231:  ok  |
      soft-irq read-recursion/231:  ok  |
      hard-irq read-recursion/312:  ok  |
      soft-irq read-recursion/312:  ok  |
      hard-irq read-recursion/321:  ok  |
      soft-irq read-recursion/321:  ok  |
  --------------------------------+-----+----------------
  Good, all 210 testcases passed! |
  --------------------------------+

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

18 files changed:
Documentation/kernel-parameters.txt
lib/Kconfig.debug
lib/Makefile
lib/locking-selftest-hardirq.h [new file with mode: 0644]
lib/locking-selftest-mutex.h [new file with mode: 0644]
lib/locking-selftest-rlock-hardirq.h [new file with mode: 0644]
lib/locking-selftest-rlock-softirq.h [new file with mode: 0644]
lib/locking-selftest-rlock.h [new file with mode: 0644]
lib/locking-selftest-rsem.h [new file with mode: 0644]
lib/locking-selftest-softirq.h [new file with mode: 0644]
lib/locking-selftest-spin-hardirq.h [new file with mode: 0644]
lib/locking-selftest-spin-softirq.h [new file with mode: 0644]
lib/locking-selftest-spin.h [new file with mode: 0644]
lib/locking-selftest-wlock-hardirq.h [new file with mode: 0644]
lib/locking-selftest-wlock-softirq.h [new file with mode: 0644]
lib/locking-selftest-wlock.h [new file with mode: 0644]
lib/locking-selftest-wsem.h [new file with mode: 0644]
lib/locking-selftest.c [new file with mode: 0644]

index 86e9282..149f62b 100644 (file)
@@ -435,6 +435,15 @@ running once the system is up.
 
        debug           [KNL] Enable kernel debugging (events log level).
 
+       debug_locks_verbose=
+                       [KNL] verbose self-tests
+                       Format=<0|1>
+                       Print debugging info while doing the locking API
+                       self-tests.
+                       We default to 0 (no extra messages), setting it to
+                       1 will print _a lot_ more information - normally
+                       only useful to kernel developers.
+
        decnet=         [HW,NET]
                        Format: <area>[,<node>]
                        See also Documentation/networking/decnet.txt.
index 91e338a..16021b0 100644 (file)
@@ -149,6 +149,17 @@ config DEBUG_SPINLOCK_SLEEP
          If you say Y here, various routines which may sleep will become very
          noisy if they are called with a spinlock held.
 
+config DEBUG_LOCKING_API_SELFTESTS
+       bool "Locking API boot-time self-tests"
+       depends on DEBUG_KERNEL
+       help
+         Say Y here if you want the kernel to run a short self-test during
+         bootup. The self-test checks whether common types of locking bugs
+         are detected by debugging mechanisms or not. (if you disable
+         lock debugging then those bugs wont be detected of course.)
+         The following locking APIs are covered: spinlocks, rwlocks,
+         mutexes and rwsems.
+
 config STACKTRACE
        bool
        depends on STACKTRACE_SUPPORT
index 4f5d019..be9719a 100644 (file)
@@ -18,6 +18,7 @@ CFLAGS_kobject.o += -DDEBUG
 CFLAGS_kobject_uevent.o += -DDEBUG
 endif
 
+obj-$(CONFIG_DEBUG_LOCKING_API_SELFTESTS) += locking-selftest.o
 obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock_debug.o
 lib-$(CONFIG_RWSEM_GENERIC_SPINLOCK) += rwsem-spinlock.o
 lib-$(CONFIG_RWSEM_XCHGADD_ALGORITHM) += rwsem.o
diff --git a/lib/locking-selftest-hardirq.h b/lib/locking-selftest-hardirq.h
new file mode 100644 (file)
index 0000000..10d4a15
--- /dev/null
@@ -0,0 +1,9 @@
+#undef IRQ_DISABLE
+#undef IRQ_ENABLE
+#undef IRQ_ENTER
+#undef IRQ_EXIT
+
+#define IRQ_ENABLE             HARDIRQ_ENABLE
+#define IRQ_DISABLE            HARDIRQ_DISABLE
+#define IRQ_ENTER              HARDIRQ_ENTER
+#define IRQ_EXIT               HARDIRQ_EXIT
diff --git a/lib/locking-selftest-mutex.h b/lib/locking-selftest-mutex.h
new file mode 100644 (file)
index 0000000..68601b6
--- /dev/null
@@ -0,0 +1,11 @@
+#undef LOCK
+#define LOCK           ML
+
+#undef UNLOCK
+#define UNLOCK         MU
+
+#undef RLOCK
+#undef WLOCK
+
+#undef INIT
+#define INIT           MI
diff --git a/lib/locking-selftest-rlock-hardirq.h b/lib/locking-selftest-rlock-hardirq.h
new file mode 100644 (file)
index 0000000..9f517eb
--- /dev/null
@@ -0,0 +1,2 @@
+#include "locking-selftest-rlock.h"
+#include "locking-selftest-hardirq.h"
diff --git a/lib/locking-selftest-rlock-softirq.h b/lib/locking-selftest-rlock-softirq.h
new file mode 100644 (file)
index 0000000..981455d
--- /dev/null
@@ -0,0 +1,2 @@
+#include "locking-selftest-rlock.h"
+#include "locking-selftest-softirq.h"
diff --git a/lib/locking-selftest-rlock.h b/lib/locking-selftest-rlock.h
new file mode 100644 (file)
index 0000000..6789044
--- /dev/null
@@ -0,0 +1,14 @@
+#undef LOCK
+#define LOCK           RL
+
+#undef UNLOCK
+#define UNLOCK         RU
+
+#undef RLOCK
+#define RLOCK          RL
+
+#undef WLOCK
+#define WLOCK          WL
+
+#undef INIT
+#define INIT           RWI
diff --git a/lib/locking-selftest-rsem.h b/lib/locking-selftest-rsem.h
new file mode 100644 (file)
index 0000000..62da886
--- /dev/null
@@ -0,0 +1,14 @@
+#undef LOCK
+#define LOCK           RSL
+
+#undef UNLOCK
+#define UNLOCK         RSU
+
+#undef RLOCK
+#define RLOCK          RSL
+
+#undef WLOCK
+#define WLOCK          WSL
+
+#undef INIT
+#define INIT           RWSI
diff --git a/lib/locking-selftest-softirq.h b/lib/locking-selftest-softirq.h
new file mode 100644 (file)
index 0000000..a83de2a
--- /dev/null
@@ -0,0 +1,9 @@
+#undef IRQ_DISABLE
+#undef IRQ_ENABLE
+#undef IRQ_ENTER
+#undef IRQ_EXIT
+
+#define IRQ_DISABLE            SOFTIRQ_DISABLE
+#define IRQ_ENABLE             SOFTIRQ_ENABLE
+#define IRQ_ENTER              SOFTIRQ_ENTER
+#define IRQ_EXIT               SOFTIRQ_EXIT
diff --git a/lib/locking-selftest-spin-hardirq.h b/lib/locking-selftest-spin-hardirq.h
new file mode 100644 (file)
index 0000000..693198d
--- /dev/null
@@ -0,0 +1,2 @@
+#include "locking-selftest-spin.h"
+#include "locking-selftest-hardirq.h"
diff --git a/lib/locking-selftest-spin-softirq.h b/lib/locking-selftest-spin-softirq.h
new file mode 100644 (file)
index 0000000..c472e2a
--- /dev/null
@@ -0,0 +1,2 @@
+#include "locking-selftest-spin.h"
+#include "locking-selftest-softirq.h"
diff --git a/lib/locking-selftest-spin.h b/lib/locking-selftest-spin.h
new file mode 100644 (file)
index 0000000..ccd1b4b
--- /dev/null
@@ -0,0 +1,11 @@
+#undef LOCK
+#define LOCK           L
+
+#undef UNLOCK
+#define UNLOCK         U
+
+#undef RLOCK
+#undef WLOCK
+
+#undef INIT
+#define INIT           SI
diff --git a/lib/locking-selftest-wlock-hardirq.h b/lib/locking-selftest-wlock-hardirq.h
new file mode 100644 (file)
index 0000000..2dd2e51
--- /dev/null
@@ -0,0 +1,2 @@
+#include "locking-selftest-wlock.h"
+#include "locking-selftest-hardirq.h"
diff --git a/lib/locking-selftest-wlock-softirq.h b/lib/locking-selftest-wlock-softirq.h
new file mode 100644 (file)
index 0000000..cb80d1c
--- /dev/null
@@ -0,0 +1,2 @@
+#include "locking-selftest-wlock.h"
+#include "locking-selftest-softirq.h"
diff --git a/lib/locking-selftest-wlock.h b/lib/locking-selftest-wlock.h
new file mode 100644 (file)
index 0000000..0815322
--- /dev/null
@@ -0,0 +1,14 @@
+#undef LOCK
+#define LOCK           WL
+
+#undef UNLOCK
+#define UNLOCK         WU
+
+#undef RLOCK
+#define RLOCK          RL
+
+#undef WLOCK
+#define WLOCK          WL
+
+#undef INIT
+#define INIT           RWI
diff --git a/lib/locking-selftest-wsem.h b/lib/locking-selftest-wsem.h
new file mode 100644 (file)
index 0000000..b88c5f2
--- /dev/null
@@ -0,0 +1,14 @@
+#undef LOCK
+#define LOCK           WSL
+
+#undef UNLOCK
+#define UNLOCK         WSU
+
+#undef RLOCK
+#define RLOCK          RSL
+
+#undef WLOCK
+#define WLOCK          WSL
+
+#undef INIT
+#define INIT           RWSI
diff --git a/lib/locking-selftest.c b/lib/locking-selftest.c
new file mode 100644 (file)
index 0000000..5cd05f2
--- /dev/null
@@ -0,0 +1,1218 @@
+/*
+ * lib/locking-selftest.c
+ *
+ * Testsuite for various locking APIs: spinlocks, rwlocks,
+ * mutexes and rw-semaphores.
+ *
+ * It is checking both false positives and false negatives.
+ *
+ * Started by Ingo Molnar:
+ *
+ *  Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
+ */
+#include <linux/rwsem.h>
+#include <linux/mutex.h>
+#include <linux/sched.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/kallsyms.h>
+#include <linux/interrupt.h>
+#include <linux/debug_locks.h>
+#include <linux/irqflags.h>
+
+/*
+ * Change this to 1 if you want to see the failure printouts:
+ */
+static unsigned int debug_locks_verbose;
+
+static int __init setup_debug_locks_verbose(char *str)
+{
+       get_option(&str, &debug_locks_verbose);
+
+       return 1;
+}
+
+__setup("debug_locks_verbose=", setup_debug_locks_verbose);
+
+#define FAILURE                0
+#define SUCCESS                1
+
+#define LOCKTYPE_SPIN  0x1
+#define LOCKTYPE_RWLOCK        0x2
+#define LOCKTYPE_MUTEX 0x4
+#define LOCKTYPE_RWSEM 0x8
+
+/*
+ * Normal standalone locks, for the circular and irq-context
+ * dependency tests:
+ */
+static DEFINE_SPINLOCK(lock_A);
+static DEFINE_SPINLOCK(lock_B);
+static DEFINE_SPINLOCK(lock_C);
+static DEFINE_SPINLOCK(lock_D);
+
+static DEFINE_RWLOCK(rwlock_A);
+static DEFINE_RWLOCK(rwlock_B);
+static DEFINE_RWLOCK(rwlock_C);
+static DEFINE_RWLOCK(rwlock_D);
+
+static DEFINE_MUTEX(mutex_A);
+static DEFINE_MUTEX(mutex_B);
+static DEFINE_MUTEX(mutex_C);
+static DEFINE_MUTEX(mutex_D);
+
+static DECLARE_RWSEM(rwsem_A);
+static DECLARE_RWSEM(rwsem_B);
+static DECLARE_RWSEM(rwsem_C);
+static DECLARE_RWSEM(rwsem_D);
+
+/*
+ * Locks that we initialize dynamically as well so that
+ * e.g. X1 and X2 becomes two instances of the same class,
+ * but X* and Y* are different classes. We do this so that
+ * we do not trigger a real lockup:
+ */
+static DEFINE_SPINLOCK(lock_X1);
+static DEFINE_SPINLOCK(lock_X2);
+static DEFINE_SPINLOCK(lock_Y1);
+static DEFINE_SPINLOCK(lock_Y2);
+static DEFINE_SPINLOCK(lock_Z1);
+static DEFINE_SPINLOCK(lock_Z2);
+
+static DEFINE_RWLOCK(rwlock_X1);
+static DEFINE_RWLOCK(rwlock_X2);
+static DEFINE_RWLOCK(rwlock_Y1);
+static DEFINE_RWLOCK(rwlock_Y2);
+static DEFINE_RWLOCK(rwlock_Z1);
+static DEFINE_RWLOCK(rwlock_Z2);
+
+static DEFINE_MUTEX(mutex_X1);
+static DEFINE_MUTEX(mutex_X2);
+static DEFINE_MUTEX(mutex_Y1);
+static DEFINE_MUTEX(mutex_Y2);
+static DEFINE_MUTEX(mutex_Z1);
+static DEFINE_MUTEX(mutex_Z2);
+
+static DECLARE_RWSEM(rwsem_X1);
+static DECLARE_RWSEM(rwsem_X2);
+static DECLARE_RWSEM(rwsem_Y1);
+static DECLARE_RWSEM(rwsem_Y2);
+static DECLARE_RWSEM(rwsem_Z1);
+static DECLARE_RWSEM(rwsem_Z2);
+
+/*
+ * non-inlined runtime initializers, to let separate locks share
+ * the same lock-class:
+ */
+#define INIT_CLASS_FUNC(class)                                 \
+static noinline void                                   \
+init_class_##class(spinlock_t *lock, rwlock_t *rwlock, struct mutex *mutex, \
+                struct rw_semaphore *rwsem)            \
+{                                                      \
+       spin_lock_init(lock);                           \
+       rwlock_init(rwlock);                            \
+       mutex_init(mutex);                              \
+       init_rwsem(rwsem);                              \
+}
+
+INIT_CLASS_FUNC(X)
+INIT_CLASS_FUNC(Y)
+INIT_CLASS_FUNC(Z)
+
+static void init_shared_classes(void)
+{
+       init_class_X(&lock_X1, &rwlock_X1, &mutex_X1, &rwsem_X1);
+       init_class_X(&lock_X2, &rwlock_X2, &mutex_X2, &rwsem_X2);
+
+       init_class_Y(&lock_Y1, &rwlock_Y1, &mutex_Y1, &rwsem_Y1);
+       init_class_Y(&lock_Y2, &rwlock_Y2, &mutex_Y2, &rwsem_Y2);
+
+       init_class_Z(&lock_Z1, &rwlock_Z1, &mutex_Z1, &rwsem_Z1);
+       init_class_Z(&lock_Z2, &rwlock_Z2, &mutex_Z2, &rwsem_Z2);
+}
+
+/*
+ * For spinlocks and rwlocks we also do hardirq-safe / softirq-safe tests.
+ * The following functions use a lock from a simulated hardirq/softirq
+ * context, causing the locks to be marked as hardirq-safe/softirq-safe:
+ */
+
+#define HARDIRQ_DISABLE                local_irq_disable
+#define HARDIRQ_ENABLE         local_irq_enable
+
+#define HARDIRQ_ENTER()                                \
+       local_irq_disable();                    \
+       irq_enter();                            \
+       WARN_ON(!in_irq());
+
+#define HARDIRQ_EXIT()                         \
+       __irq_exit();                           \
+       local_irq_enable();
+
+#define SOFTIRQ_DISABLE                local_bh_disable
+#define SOFTIRQ_ENABLE         local_bh_enable
+
+#define SOFTIRQ_ENTER()                                \
+               local_bh_disable();             \
+               local_irq_disable();            \
+               trace_softirq_enter();          \
+               WARN_ON(!in_softirq());
+
+#define SOFTIRQ_EXIT()                         \
+               trace_softirq_exit();           \
+               local_irq_enable();             \
+               local_bh_enable();
+
+/*
+ * Shortcuts for lock/unlock API variants, to keep
+ * the testcases compact:
+ */
+#define L(x)                   spin_lock(&lock_##x)
+#define U(x)                   spin_unlock(&lock_##x)
+#define LU(x)                  L(x); U(x)
+#define SI(x)                  spin_lock_init(&lock_##x)
+
+#define WL(x)                  write_lock(&rwlock_##x)
+#define WU(x)                  write_unlock(&rwlock_##x)
+#define WLU(x)                 WL(x); WU(x)
+
+#define RL(x)                  read_lock(&rwlock_##x)
+#define RU(x)                  read_unlock(&rwlock_##x)
+#define RLU(x)                 RL(x); RU(x)
+#define RWI(x)                 rwlock_init(&rwlock_##x)
+
+#define ML(x)                  mutex_lock(&mutex_##x)
+#define MU(x)                  mutex_unlock(&mutex_##x)
+#define MI(x)                  mutex_init(&mutex_##x)
+
+#define WSL(x)                 down_write(&rwsem_##x)
+#define WSU(x)                 up_write(&rwsem_##x)
+
+#define RSL(x)                 down_read(&rwsem_##x)
+#define RSU(x)                 up_read(&rwsem_##x)
+#define RWSI(x)                        init_rwsem(&rwsem_##x)
+
+#define LOCK_UNLOCK_2(x,y)     LOCK(x); LOCK(y); UNLOCK(y); UNLOCK(x)
+
+/*
+ * Generate different permutations of the same testcase, using
+ * the same basic lock-dependency/state events:
+ */
+
+#define GENERATE_TESTCASE(name)                        \
+                                               \
+static void name(void) { E(); }
+
+#define GENERATE_PERMUTATIONS_2_EVENTS(name)   \
+                                               \
+static void name##_12(void) { E1(); E2(); }    \
+static void name##_21(void) { E2(); E1(); }
+
+#define GENERATE_PERMUTATIONS_3_EVENTS(name)           \
+                                                       \
+static void name##_123(void) { E1(); E2(); E3(); }     \
+static void name##_132(void) { E1(); E3(); E2(); }     \
+static void name##_213(void) { E2(); E1(); E3(); }     \
+static void name##_231(void) { E2(); E3(); E1(); }     \
+static void name##_312(void) { E3(); E1(); E2(); }     \
+static void name##_321(void) { E3(); E2(); E1(); }
+
+/*
+ * AA deadlock:
+ */
+
+#define E()                                    \
+                                               \
+       LOCK(X1);                               \
+       LOCK(X2); /* this one should fail */
+
+/*
+ * 6 testcases:
+ */
+#include "locking-selftest-spin.h"
+GENERATE_TESTCASE(AA_spin)
+#include "locking-selftest-wlock.h"
+GENERATE_TESTCASE(AA_wlock)
+#include "locking-selftest-rlock.h"
+GENERATE_TESTCASE(AA_rlock)
+#include "locking-selftest-mutex.h"
+GENERATE_TESTCASE(AA_mutex)
+#include "locking-selftest-wsem.h"
+GENERATE_TESTCASE(AA_wsem)
+#include "locking-selftest-rsem.h"
+GENERATE_TESTCASE(AA_rsem)
+
+#undef E
+
+/*
+ * Special-case for read-locking, they are
+ * allowed to recurse on the same lock instance:
+ */
+static void rlock_AA1(void)
+{
+       RL(X1);
+       RL(X1); // this one should NOT fail
+}
+
+static void rlock_AA1B(void)
+{
+       RL(X1);
+       RL(X2); // this one should fail
+}
+
+static void rsem_AA1(void)
+{
+       RSL(X1);
+       RSL(X1); // this one should fail
+}
+
+static void rsem_AA1B(void)
+{
+       RSL(X1);
+       RSL(X2); // this one should fail
+}
+/*
+ * The mixing of read and write locks is not allowed:
+ */
+static void rlock_AA2(void)
+{
+       RL(X1);
+       WL(X2); // this one should fail
+}
+
+static void rsem_AA2(void)
+{
+       RSL(X1);
+       WSL(X2); // this one should fail
+}
+
+static void rlock_AA3(void)
+{
+       WL(X1);
+       RL(X2); // this one should fail
+}
+
+static void rsem_AA3(void)
+{
+       WSL(X1);
+       RSL(X2); // this one should fail
+}
+
+/*
+ * ABBA deadlock:
+ */
+
+#define E()                                    \
+                                               \
+       LOCK_UNLOCK_2(A, B);                    \
+       LOCK_UNLOCK_2(B, A); /* fail */
+
+/*
+ * 6 testcases:
+ */
+#include "locking-selftest-spin.h"
+GENERATE_TESTCASE(ABBA_spin)
+#include "locking-selftest-wlock.h"
+GENERATE_TESTCASE(ABBA_wlock)
+#include "locking-selftest-rlock.h"
+GENERATE_TESTCASE(ABBA_rlock)
+#include "locking-selftest-mutex.h"
+GENERATE_TESTCASE(ABBA_mutex)
+#include "locking-selftest-wsem.h"
+GENERATE_TESTCASE(ABBA_wsem)
+#include "locking-selftest-rsem.h"
+GENERATE_TESTCASE(ABBA_rsem)
+
+#undef E
+
+/*
+ * AB BC CA deadlock:
+ */
+
+#define E()                                    \
+                                               \
+       LOCK_UNLOCK_2(A, B);                    \
+       LOCK_UNLOCK_2(B, C);                    \
+       LOCK_UNLOCK_2(C, A); /* fail */
+
+/*
+ * 6 testcases:
+ */
+#include "locking-selftest-spin.h"
+GENERATE_TESTCASE(ABBCCA_spin)
+#include "locking-selftest-wlock.h"
+GENERATE_TESTCASE(ABBCCA_wlock)
+#include "locking-selftest-rlock.h"
+GENERATE_TESTCASE(ABBCCA_rlock)
+#include "locking-selftest-mutex.h"
+GENERATE_TESTCASE(ABBCCA_mutex)
+#include "locking-selftest-wsem.h"
+GENERATE_TESTCASE(ABBCCA_wsem)
+#include "locking-selftest-rsem.h"
+GENERATE_TESTCASE(ABBCCA_rsem)
+
+#undef E
+
+/*
+ * AB CA BC deadlock:
+ */
+
+#define E()                                    \
+                                               \
+       LOCK_UNLOCK_2(A, B);                    \
+       LOCK_UNLOCK_2(C, A);                    \
+       LOCK_UNLOCK_2(B, C); /* fail */
+
+/*
+ * 6 testcases:
+ */
+#include "locking-selftest-spin.h"
+GENERATE_TESTCASE(ABCABC_spin)
+#include "locking-selftest-wlock.h"
+GENERATE_TESTCASE(ABCABC_wlock)
+#include "locking-selftest-rlock.h"
+GENERATE_TESTCASE(ABCABC_rlock)
+#include "locking-selftest-mutex.h"
+GENERATE_TESTCASE(ABCABC_mutex)
+#include "locking-selftest-wsem.h"
+GENERATE_TESTCASE(ABCABC_wsem)
+#include "locking-selftest-rsem.h"
+GENERATE_TESTCASE(ABCABC_rsem)
+
+#undef E
+
+/*
+ * AB BC CD DA deadlock:
+ */
+
+#define E()                                    \
+                                               \
+       LOCK_UNLOCK_2(A, B);                    \
+       LOCK_UNLOCK_2(B, C);                    \
+       LOCK_UNLOCK_2(C, D);                    \
+       LOCK_UNLOCK_2(D, A); /* fail */
+
+/*
+ * 6 testcases:
+ */
+#include "locking-selftest-spin.h"
+GENERATE_TESTCASE(ABBCCDDA_spin)
+#include "locking-selftest-wlock.h"
+GENERATE_TESTCASE(ABBCCDDA_wlock)
+#include "locking-selftest-rlock.h"
+GENERATE_TESTCASE(ABBCCDDA_rlock)
+#include "locking-selftest-mutex.h"
+GENERATE_TESTCASE(ABBCCDDA_mutex)
+#include "locking-selftest-wsem.h"
+GENERATE_TESTCASE(ABBCCDDA_wsem)
+#include "locking-selftest-rsem.h"
+GENERATE_TESTCASE(ABBCCDDA_rsem)
+
+#undef E
+
+/*
+ * AB CD BD DA deadlock:
+ */
+#define E()                                    \
+                                               \
+       LOCK_UNLOCK_2(A, B);                    \
+       LOCK_UNLOCK_2(C, D);                    \
+       LOCK_UNLOCK_2(B, D);                    \
+       LOCK_UNLOCK_2(D, A); /* fail */
+
+/*
+ * 6 testcases:
+ */
+#include "locking-selftest-spin.h"
+GENERATE_TESTCASE(ABCDBDDA_spin)
+#include "locking-selftest-wlock.h"
+GENERATE_TESTCASE(ABCDBDDA_wlock)
+#include "locking-selftest-rlock.h"
+GENERATE_TESTCASE(ABCDBDDA_rlock)
+#include "locking-selftest-mutex.h"
+GENERATE_TESTCASE(ABCDBDDA_mutex)
+#include "locking-selftest-wsem.h"
+GENERATE_TESTCASE(ABCDBDDA_wsem)
+#include "locking-selftest-rsem.h"
+GENERATE_TESTCASE(ABCDBDDA_rsem)
+
+#undef E
+
+/*
+ * AB CD BC DA deadlock:
+ */
+#define E()                                    \
+                                               \
+       LOCK_UNLOCK_2(A, B);                    \
+       LOCK_UNLOCK_2(C, D);                    \
+       LOCK_UNLOCK_2(B, C);                    \
+       LOCK_UNLOCK_2(D, A); /* fail */
+
+/*
+ * 6 testcases:
+ */
+#include "locking-selftest-spin.h"
+GENERATE_TESTCASE(ABCDBCDA_spin)
+#include "locking-selftest-wlock.h"
+GENERATE_TESTCASE(ABCDBCDA_wlock)
+#include "locking-selftest-rlock.h"
+GENERATE_TESTCASE(ABCDBCDA_rlock)
+#include "locking-selftest-mutex.h"
+GENERATE_TESTCASE(ABCDBCDA_mutex)
+#include "locking-selftest-wsem.h"
+GENERATE_TESTCASE(ABCDBCDA_wsem)
+#include "locking-selftest-rsem.h"
+GENERATE_TESTCASE(ABCDBCDA_rsem)
+
+#undef E
+
+/*
+ * Double unlock:
+ */
+#define E()                                    \
+                                               \
+       LOCK(A);                                \
+       UNLOCK(A);                              \
+       UNLOCK(A); /* fail */
+
+/*
+ * 6 testcases:
+ */
+#include "locking-selftest-spin.h"
+GENERATE_TESTCASE(double_unlock_spin)
+#include "locking-selftest-wlock.h"
+GENERATE_TESTCASE(double_unlock_wlock)
+#include "locking-selftest-rlock.h"
+GENERATE_TESTCASE(double_unlock_rlock)
+#include "locking-selftest-mutex.h"
+GENERATE_TESTCASE(double_unlock_mutex)
+#include "locking-selftest-wsem.h"
+GENERATE_TESTCASE(double_unlock_wsem)
+#include "locking-selftest-rsem.h"
+GENERATE_TESTCASE(double_unlock_rsem)
+
+#undef E
+
+/*
+ * Bad unlock ordering:
+ */
+#define E()                                    \
+                                               \
+       LOCK(A);                                \
+       LOCK(B);                                \
+       UNLOCK(A); /* fail */                   \
+       UNLOCK(B);
+
+/*
+ * 6 testcases:
+ */
+#include "locking-selftest-spin.h"
+GENERATE_TESTCASE(bad_unlock_order_spin)
+#include "locking-selftest-wlock.h"
+GENERATE_TESTCASE(bad_unlock_order_wlock)
+#include "locking-selftest-rlock.h"
+GENERATE_TESTCASE(bad_unlock_order_rlock)
+#include "locking-selftest-mutex.h"
+GENERATE_TESTCASE(bad_unlock_order_mutex)
+#include "locking-selftest-wsem.h"
+GENERATE_TESTCASE(bad_unlock_order_wsem)
+#include "locking-selftest-rsem.h"
+GENERATE_TESTCASE(bad_unlock_order_rsem)
+
+#undef E
+
+/*
+ * initializing a held lock:
+ */
+#define E()                                    \
+                                               \
+       LOCK(A);                                \
+       INIT(A); /* fail */
+
+/*
+ * 6 testcases:
+ */
+#include "locking-selftest-spin.h"
+GENERATE_TESTCASE(init_held_spin)
+#include "locking-selftest-wlock.h"
+GENERATE_TESTCASE(init_held_wlock)
+#include "locking-selftest-rlock.h"
+GENERATE_TESTCASE(init_held_rlock)
+#include "locking-selftest-mutex.h"
+GENERATE_TESTCASE(init_held_mutex)
+#include "locking-selftest-wsem.h"
+GENERATE_TESTCASE(init_held_wsem)
+#include "locking-selftest-rsem.h"
+GENERATE_TESTCASE(init_held_rsem)
+
+#undef E
+
+/*
+ * locking an irq-safe lock with irqs enabled:
+ */
+#define E1()                           \
+                                       \
+       IRQ_ENTER();                    \
+       LOCK(A);                        \
+       UNLOCK(A);                      \
+       IRQ_EXIT();
+
+#define E2()                           \
+                                       \
+       LOCK(A);                        \
+       UNLOCK(A);
+
+/*
+ * Generate 24 testcases:
+ */
+#include "locking-selftest-spin-hardirq.h"
+GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_spin)
+
+#include "locking-selftest-rlock-hardirq.h"
+GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_rlock)
+
+#include "locking-selftest-wlock-hardirq.h"
+GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_wlock)
+
+#include "locking-selftest-spin-softirq.h"
+GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_spin)
+
+#include "locking-selftest-rlock-softirq.h"
+GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_rlock)
+
+#include "locking-selftest-wlock-softirq.h"
+GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_wlock)
+
+#undef E1
+#undef E2
+
+/*
+ * Enabling hardirqs with a softirq-safe lock held:
+ */
+#define E1()                           \
+                                       \
+       SOFTIRQ_ENTER();                \
+       LOCK(A);                        \
+       UNLOCK(A);                      \
+       SOFTIRQ_EXIT();
+
+#define E2()                           \
+                                       \
+       HARDIRQ_DISABLE();              \
+       LOCK(A);                        \
+       HARDIRQ_ENABLE();               \
+       UNLOCK(A);
+
+/*
+ * Generate 12 testcases:
+ */
+#include "locking-selftest-spin.h"
+GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_spin)
+
+#include "locking-selftest-wlock.h"
+GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_wlock)
+
+#include "locking-selftest-rlock.h"
+GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_rlock)
+
+#undef E1
+#undef E2
+
+/*
+ * Enabling irqs with an irq-safe lock held:
+ */
+#define E1()                           \
+                                       \
+       IRQ_ENTER();                    \
+       LOCK(A);                        \
+       UNLOCK(A);                      \
+       IRQ_EXIT();
+
+#define E2()                           \
+                                       \
+       IRQ_DISABLE();                  \
+       LOCK(A);                        \
+       IRQ_ENABLE();                   \
+       UNLOCK(A);
+
+/*
+ * Generate 24 testcases:
+ */
+#include "locking-selftest-spin-hardirq.h"
+GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_spin)
+
+#include "locking-selftest-rlock-hardirq.h"
+GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_rlock)
+
+#include "locking-selftest-wlock-hardirq.h"
+GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_wlock)
+
+#include "locking-selftest-spin-softirq.h"
+GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_spin)
+
+#include "locking-selftest-rlock-softirq.h"
+GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_rlock)
+
+#include "locking-selftest-wlock-softirq.h"
+GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_wlock)
+
+#undef E1
+#undef E2
+
+/*
+ * Acquiring a irq-unsafe lock while holding an irq-safe-lock:
+ */
+#define E1()                           \
+                                       \
+       LOCK(A);                        \
+       LOCK(B);                        \
+       UNLOCK(B);                      \
+       UNLOCK(A);                      \
+
+#define E2()                           \
+                                       \
+       LOCK(B);                        \
+       UNLOCK(B);
+
+#define E3()                           \
+                                       \
+       IRQ_ENTER();                    \
+       LOCK(A);                        \
+       UNLOCK(A);                      \
+       IRQ_EXIT();
+
+/*
+ * Generate 36 testcases:
+ */
+#include "locking-selftest-spin-hardirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_spin)
+
+#include "locking-selftest-rlock-hardirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_rlock)
+
+#include "locking-selftest-wlock-hardirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_wlock)
+
+#include "locking-selftest-spin-softirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_spin)
+
+#include "locking-selftest-rlock-softirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_rlock)
+
+#include "locking-selftest-wlock-softirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_wlock)
+
+#undef E1
+#undef E2
+#undef E3
+
+/*
+ * If a lock turns into softirq-safe, but earlier it took
+ * a softirq-unsafe lock:
+ */
+
+#define E1()                           \
+       IRQ_DISABLE();                  \
+       LOCK(A);                        \
+       LOCK(B);                        \
+       UNLOCK(B);                      \
+       UNLOCK(A);                      \
+       IRQ_ENABLE();
+
+#define E2()                           \
+       LOCK(B);                        \
+       UNLOCK(B);
+
+#define E3()                           \
+       IRQ_ENTER();                    \
+       LOCK(A);                        \
+       UNLOCK(A);                      \
+       IRQ_EXIT();
+
+/*
+ * Generate 36 testcases:
+ */
+#include "locking-selftest-spin-hardirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_spin)
+
+#include "locking-selftest-rlock-hardirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_rlock)
+
+#include "locking-selftest-wlock-hardirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_wlock)
+
+#include "locking-selftest-spin-softirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_spin)
+
+#include "locking-selftest-rlock-softirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_rlock)
+
+#include "locking-selftest-wlock-softirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_wlock)
+
+#undef E1
+#undef E2
+#undef E3
+
+/*
+ * read-lock / write-lock irq inversion.
+ *
+ * Deadlock scenario:
+ *
+ * CPU#1 is at #1, i.e. it has write-locked A, but has not
+ * taken B yet.
+ *
+ * CPU#2 is at #2, i.e. it has locked B.
+ *
+ * Hardirq hits CPU#2 at point #2 and is trying to read-lock A.
+ *
+ * The deadlock occurs because CPU#1 will spin on B, and CPU#2
+ * will spin on A.
+ */
+
+#define E1()                           \
+                                       \
+       IRQ_DISABLE();                  \
+       WL(A);                          \
+       LOCK(B);                        \
+       UNLOCK(B);                      \
+       WU(A);                          \
+       IRQ_ENABLE();
+
+#define E2()                           \
+                                       \
+       LOCK(B);                        \
+       UNLOCK(B);
+
+#define E3()                           \
+                                       \
+       IRQ_ENTER();                    \
+       RL(A);                          \
+       RU(A);                          \
+       IRQ_EXIT();
+
+/*
+ * Generate 36 testcases:
+ */
+#include "locking-selftest-spin-hardirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_spin)
+
+#include "locking-selftest-rlock-hardirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_rlock)
+
+#include "locking-selftest-wlock-hardirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_wlock)
+
+#include "locking-selftest-spin-softirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_spin)
+
+#include "locking-selftest-rlock-softirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_rlock)
+
+#include "locking-selftest-wlock-softirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_wlock)
+
+#undef E1
+#undef E2
+#undef E3
+
+/*
+ * read-lock / write-lock recursion that is actually safe.
+ */
+
+#define E1()                           \
+                                       \
+       IRQ_DISABLE();                  \
+       WL(A);                          \
+       WU(A);                          \
+       IRQ_ENABLE();
+
+#define E2()                           \
+                                       \
+       RL(A);                          \
+       RU(A);                          \
+
+#define E3()                           \
+                                       \
+       IRQ_ENTER();                    \
+       RL(A);                          \
+       L(B);                           \
+       U(B);                           \
+       RU(A);                          \
+       IRQ_EXIT();
+
+/*
+ * Generate 12 testcases:
+ */
+#include "locking-selftest-hardirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_hard)
+
+#include "locking-selftest-softirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_soft)
+
+#undef E1
+#undef E2
+#undef E3
+
+/*
+ * read-lock / write-lock recursion that is unsafe.
+ */
+
+#define E1()                           \
+                                       \
+       IRQ_DISABLE();                  \
+       L(B);                           \
+       WL(A);                          \
+       WU(A);                          \
+       U(B);                           \
+       IRQ_ENABLE();
+
+#define E2()                           \
+                                       \
+       RL(A);                          \
+       RU(A);                          \
+
+#define E3()                           \
+                                       \
+       IRQ_ENTER();                    \
+       L(B);                           \
+       U(B);                           \
+       IRQ_EXIT();
+
+/*
+ * Generate 12 testcases:
+ */
+#include "locking-selftest-hardirq.h"
+// GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_hard)
+
+#include "locking-selftest-softirq.h"
+// GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_soft)
+
+#define lockdep_reset()
+#define lockdep_reset_lock(x)
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+# define I_SPINLOCK(x) lockdep_reset_lock(&lock_##x.dep_map)
+# define I_RWLOCK(x)   lockdep_reset_lock(&rwlock_##x.dep_map)
+# define I_MUTEX(x)    lockdep_reset_lock(&mutex_##x.dep_map)
+# define I_RWSEM(x)    lockdep_reset_lock(&rwsem_##x.dep_map)
+#else
+# define I_SPINLOCK(x)
+# define I_RWLOCK(x)
+# define I_MUTEX(x)
+# define I_RWSEM(x)
+#endif
+
+#define I1(x)                                  \
+       do {                                    \
+               I_SPINLOCK(x);                  \
+               I_RWLOCK(x);                    \
+               I_MUTEX(x);                     \
+               I_RWSEM(x);                     \
+       } while (0)
+
+#define I2(x)                                  \
+       do {                                    \
+               spin_lock_init(&lock_##x);      \
+               rwlock_init(&rwlock_##x);       \
+               mutex_init(&mutex_##x);         \
+               init_rwsem(&rwsem_##x);         \
+       } while (0)
+
+static void reset_locks(void)
+{
+       local_irq_disable();
+       I1(A); I1(B); I1(C); I1(D);
+       I1(X1); I1(X2); I1(Y1); I1(Y2); I1(Z1); I1(Z2);
+       lockdep_reset();
+       I2(A); I2(B); I2(C); I2(D);
+       init_shared_classes();
+       local_irq_enable();
+}
+
+#undef I
+
+static int testcase_total;
+static int testcase_successes;
+static int expected_testcase_failures;
+static int unexpected_testcase_failures;
+
+static void dotest(void (*testcase_fn)(void), int expected, int lockclass_mask)
+{
+       unsigned long saved_preempt_count = preempt_count();
+       int expected_failure = 0;
+
+       WARN_ON(irqs_disabled());
+
+       testcase_fn();
+       /*
+        * Filter out expected failures:
+        */
+#ifndef CONFIG_PROVE_LOCKING
+       if ((lockclass_mask & LOCKTYPE_SPIN) && debug_locks != expected)
+               expected_failure = 1;
+       if ((lockclass_mask & LOCKTYPE_RWLOCK) && debug_locks != expected)
+               expected_failure = 1;
+       if ((lockclass_mask & LOCKTYPE_MUTEX) && debug_locks != expected)
+               expected_failure = 1;
+       if ((lockclass_mask & LOCKTYPE_RWSEM) && debug_locks != expected)
+               expected_failure = 1;
+#endif
+       if (debug_locks != expected) {
+               if (expected_failure) {
+                       expected_testcase_failures++;
+                       printk("failed|");
+               } else {
+                       unexpected_testcase_failures++;
+                       printk("FAILED|");
+               }
+       } else {
+               testcase_successes++;
+               printk("  ok  |");
+       }
+       testcase_total++;
+
+       if (debug_locks_verbose)
+               printk(" lockclass mask: %x, debug_locks: %d, expected: %d\n",
+                       lockclass_mask, debug_locks, expected);
+       /*
+        * Some tests (e.g. double-unlock) might corrupt the preemption
+        * count, so restore it:
+        */
+       preempt_count() = saved_preempt_count;
+#ifdef CONFIG_TRACE_IRQFLAGS
+       if (softirq_count())
+               current->softirqs_enabled = 0;
+       else
+               current->softirqs_enabled = 1;
+#endif
+
+       reset_locks();
+}
+
+static inline void print_testname(const char *testname)
+{
+       printk("%33s:", testname);
+}
+
+#define DO_TESTCASE_1(desc, name, nr)                          \
+       print_testname(desc"/"#nr);                             \
+       dotest(name##_##nr, SUCCESS, LOCKTYPE_RWLOCK);          \
+       printk("\n");
+
+#define DO_TESTCASE_1B(desc, name, nr)                         \
+       print_testname(desc"/"#nr);                             \
+       dotest(name##_##nr, FAILURE, LOCKTYPE_RWLOCK);          \
+       printk("\n");
+
+#define DO_TESTCASE_3(desc, name, nr)                          \
+       print_testname(desc"/"#nr);                             \
+       dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN);       \
+       dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK);    \
+       dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK);    \
+       printk("\n");
+
+#define DO_TESTCASE_3RW(desc, name, nr)                                \
+       print_testname(desc"/"#nr);                             \
+       dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN|LOCKTYPE_RWLOCK);\
+       dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK);    \
+       dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK);    \
+       printk("\n");
+
+#define DO_TESTCASE_6(desc, name)                              \
+       print_testname(desc);                                   \
+       dotest(name##_spin, FAILURE, LOCKTYPE_SPIN);            \
+       dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK);         \
+       dotest(name##_rlock, FAILURE, LOCKTYPE_RWLOCK);         \
+       dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX);          \
+       dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM);           \
+       dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM);           \
+       printk("\n");
+
+#define DO_TESTCASE_6_SUCCESS(desc, name)                      \
+       print_testname(desc);                                   \
+       dotest(name##_spin, SUCCESS, LOCKTYPE_SPIN);            \
+       dotest(name##_wlock, SUCCESS, LOCKTYPE_RWLOCK);         \
+       dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK);         \
+       dotest(name##_mutex, SUCCESS, LOCKTYPE_MUTEX);          \
+       dotest(name##_wsem, SUCCESS, LOCKTYPE_RWSEM);           \
+       dotest(name##_rsem, SUCCESS, LOCKTYPE_RWSEM);           \
+       printk("\n");
+
+/*
+ * 'read' variant: rlocks must not trigger.
+ */
+#define DO_TESTCASE_6R(desc, name)                             \
+       print_testname(desc);                                   \
+       dotest(name##_spin, FAILURE, LOCKTYPE_SPIN);            \
+       dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK);         \
+       dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK);         \
+       dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX);          \
+       dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM);           \
+       dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM);           \
+       printk("\n");
+
+#define DO_TESTCASE_2I(desc, name, nr)                         \
+       DO_TESTCASE_1("hard-"desc, name##_hard, nr);            \
+       DO_TESTCASE_1("soft-"desc, name##_soft, nr);
+
+#define DO_TESTCASE_2IB(desc, name, nr)                                \
+       DO_TESTCASE_1B("hard-"desc, name##_hard, nr);           \
+       DO_TESTCASE_1B("soft-"desc, name##_soft, nr);
+
+#define DO_TESTCASE_6I(desc, name, nr)                         \
+       DO_TESTCASE_3("hard-"desc, name##_hard, nr);            \
+       DO_TESTCASE_3("soft-"desc, name##_soft, nr);
+
+#define DO_TESTCASE_6IRW(desc, name, nr)                       \
+       DO_TESTCASE_3RW("hard-"desc, name##_hard, nr);          \
+       DO_TESTCASE_3RW("soft-"desc, name##_soft, nr);
+
+#define DO_TESTCASE_2x3(desc, name)                            \
+       DO_TESTCASE_3(desc, name, 12);                          \
+       DO_TESTCASE_3(desc, name, 21);
+
+#define DO_TESTCASE_2x6(desc, name)                            \
+       DO_TESTCASE_6I(desc, name, 12);                         \
+       DO_TESTCASE_6I(desc, name, 21);
+
+#define DO_TESTCASE_6x2(desc, name)                            \
+       DO_TESTCASE_2I(desc, name, 123);                        \
+       DO_TESTCASE_2I(desc, name, 132);                        \
+       DO_TESTCASE_2I(desc, name, 213);                        \
+       DO_TESTCASE_2I(desc, name, 231);                        \
+       DO_TESTCASE_2I(desc, name, 312);                        \
+       DO_TESTCASE_2I(desc, name, 321);
+
+#define DO_TESTCASE_6x2B(desc, name)                           \
+       DO_TESTCASE_2IB(desc, name, 123);                       \
+       DO_TESTCASE_2IB(desc, name, 132);                       \
+       DO_TESTCASE_2IB(desc, name, 213);                       \
+       DO_TESTCASE_2IB(desc, name, 231);                       \
+       DO_TESTCASE_2IB(desc, name, 312);                       \
+       DO_TESTCASE_2IB(desc, name, 321);
+
+#define DO_TESTCASE_6x6(desc, name)                            \
+       DO_TESTCASE_6I(desc, name, 123);                        \
+       DO_TESTCASE_6I(desc, name, 132);                        \
+       DO_TESTCASE_6I(desc, name, 213);                        \
+       DO_TESTCASE_6I(desc, name, 231);                        \
+       DO_TESTCASE_6I(desc, name, 312);                        \
+       DO_TESTCASE_6I(desc, name, 321);
+
+#define DO_TESTCASE_6x6RW(desc, name)                          \
+       DO_TESTCASE_6IRW(desc, name, 123);                      \
+       DO_TESTCASE_6IRW(desc, name, 132);                      \
+       DO_TESTCASE_6IRW(desc, name, 213);                      \
+       DO_TESTCASE_6IRW(desc, name, 231);                      \
+       DO_TESTCASE_6IRW(desc, name, 312);                      \
+       DO_TESTCASE_6IRW(desc, name, 321);
+
+
+void locking_selftest(void)
+{
+       /*
+        * Got a locking failure before the selftest ran?
+        */
+       if (!debug_locks) {
+               printk("----------------------------------\n");
+               printk("| Locking API testsuite disabled |\n");
+               printk("----------------------------------\n");
+               return;
+       }
+
+       /*
+        * Run the testsuite:
+        */
+       printk("------------------------\n");
+       printk("| Locking API testsuite:\n");
+       printk("----------------------------------------------------------------------------\n");
+       printk("                                 | spin |wlock |rlock |mutex | wsem | rsem |\n");
+       printk("  --------------------------------------------------------------------------\n");
+
+       init_shared_classes();
+       debug_locks_silent = !debug_locks_verbose;
+
+       DO_TESTCASE_6("A-A deadlock", AA);
+       DO_TESTCASE_6R("A-B-B-A deadlock", ABBA);
+       DO_TESTCASE_6R("A-B-B-C-C-A deadlock", ABBCCA);
+       DO_TESTCASE_6R("A-B-C-A-B-C deadlock", ABCABC);
+       DO_TESTCASE_6R("A-B-B-C-C-D-D-A deadlock", ABBCCDDA);
+       DO_TESTCASE_6R("A-B-C-D-B-D-D-A deadlock", ABCDBDDA);
+       DO_TESTCASE_6R("A-B-C-D-B-C-D-A deadlock", ABCDBCDA);
+       DO_TESTCASE_6("double unlock", double_unlock);
+       DO_TESTCASE_6("initialize held", init_held);
+       DO_TESTCASE_6_SUCCESS("bad unlock order", bad_unlock_order);
+
+       printk("  --------------------------------------------------------------------------\n");
+       print_testname("recursive read-lock");
+       printk("             |");
+       dotest(rlock_AA1, SUCCESS, LOCKTYPE_RWLOCK);
+       printk("             |");
+       dotest(rsem_AA1, FAILURE, LOCKTYPE_RWSEM);
+       printk("\n");
+
+       print_testname("recursive read-lock #2");
+       printk("             |");
+       dotest(rlock_AA1B, FAILURE, LOCKTYPE_RWLOCK);
+       printk("             |");
+       dotest(rsem_AA1B, FAILURE, LOCKTYPE_RWSEM);
+       printk("\n");
+
+       print_testname("mixed read-write-lock");
+       printk("             |");
+       dotest(rlock_AA2, FAILURE, LOCKTYPE_RWLOCK);
+       printk("             |");
+       dotest(rsem_AA2, FAILURE, LOCKTYPE_RWSEM);
+       printk("\n");
+
+       print_testname("mixed write-read-lock");
+       printk("             |");
+       dotest(rlock_AA3, FAILURE, LOCKTYPE_RWLOCK);
+       printk("             |");
+       dotest(rsem_AA3, FAILURE, LOCKTYPE_RWSEM);
+       printk("\n");
+
+       printk("  --------------------------------------------------------------------------\n");
+
+       /*
+        * irq-context testcases:
+        */
+       DO_TESTCASE_2x6("irqs-on + irq-safe-A", irqsafe1);
+       DO_TESTCASE_2x3("sirq-safe-A => hirqs-on", irqsafe2A);
+       DO_TESTCASE_2x6("safe-A + irqs-on", irqsafe2B);
+       DO_TESTCASE_6x6("safe-A + unsafe-B #1", irqsafe3);
+       DO_TESTCASE_6x6("safe-A + unsafe-B #2", irqsafe4);
+       DO_TESTCASE_6x6RW("irq lock-inversion", irq_inversion);
+
+       DO_TESTCASE_6x2("irq read-recursion", irq_read_recursion);
+//     DO_TESTCASE_6x2B("irq read-recursion #2", irq_read_recursion2);
+
+       if (unexpected_testcase_failures) {
+               printk("-----------------------------------------------------------------\n");
+               debug_locks = 0;
+               printk("BUG: %3d unexpected failures (out of %3d) - debugging disabled! |\n",
+                       unexpected_testcase_failures, testcase_total);
+               printk("-----------------------------------------------------------------\n");
+       } else if (expected_testcase_failures && testcase_successes) {
+               printk("--------------------------------------------------------\n");
+               printk("%3d out of %3d testcases failed, as expected. |\n",
+                       expected_testcase_failures, testcase_total);
+               printk("----------------------------------------------------\n");
+               debug_locks = 1;
+       } else if (expected_testcase_failures && !testcase_successes) {
+               printk("--------------------------------------------------------\n");
+               printk("All %3d testcases failed, as expected. |\n",
+                       expected_testcase_failures);
+               printk("----------------------------------------\n");
+               debug_locks = 1;
+       } else {
+               printk("-------------------------------------------------------\n");
+               printk("Good, all %3d testcases passed! |\n",
+                       testcase_successes);
+               printk("---------------------------------\n");
+               debug_locks = 1;
+       }
+       debug_locks_silent = 0;
+}