locking/selftest: Support queued rwlock

The queued rwlock does not support the use of recursive read-lock in
the process context. With changes in the lockdep code to check and
disallow recursive read-lock, it is also necessary for the locking
selftest to be updated to change the process context recursive read
locking results from SUCCESS to FAILURE for rwlock.

Signed-off-by: Waiman Long <Waiman.Long@hp.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Scott J Norton <scott.norton@hp.com>
Cc: Fengguang Wu <fengguang.wu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/1407345722-61615-3-git-send-email-Waiman.Long@hp.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 49 insertions, 7 deletions

diff --git a/lib/locking-selftest.c b/lib/locking-selftest.c
index 872a15a2a637..62af709b2083 100644
--- a/lib/locking-selftest.c
+++ b/lib/locking-selftest.c
@@ -267,19 +267,46 @@ GENERATE_TESTCASE(AA_rsem)
 #undef E
 
 /*
- * Special-case for read-locking, they are
- * allowed to recurse on the same lock class:
+ * Special-case for read-locking, they are not allowed to
+ * recurse on the same lock class except under interrupt context:
  */
 static void rlock_AA1(void)
 {
         RL(X1);
-        RL(X1); // this one should NOT fail
+        RL(X1); // this one should fail
 }
 
 static void rlock_AA1B(void)
 {
         RL(X1);
-        RL(X2); // this one should NOT fail
+        RL(X2); // this one should fail
+}
+
+static void rlock_AHA1(void)
+{
+        RL(X1);
+        HARDIRQ_ENTER();
+        RL(X1); // this one should NOT fail
+        HARDIRQ_EXIT();
+}
+
+static void rlock_AHA1B(void)
+{
+        RL(X1);
+        HARDIRQ_ENTER();
+        RL(X2); // this one should NOT fail
+        HARDIRQ_EXIT();
+}
+
+static void rlock_ASAHA1(void)
+{
+        RL(X1);
+        SOFTIRQ_ENTER();
+        RL(X1); // this one should NOT fail
+        HARDIRQ_ENTER();
+        RL(X1); // this one should NOT fail
+        HARDIRQ_EXIT();
+        SOFTIRQ_EXIT();
 }
 
 static void rsem_AA1(void)
@@ -1069,7 +1096,7 @@ static inline void print_testname(const char *testname)
         print_testname(desc);                                   \
         dotest(name##_spin, FAILURE, LOCKTYPE_SPIN);            \
         dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK);         \
-        dotest(name##_rlock, SUCCESS, 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);           \
@@ -1830,14 +1857,14 @@ void locking_selftest(void)
         printk("  --------------------------------------------------------------------------\n");
         print_testname("recursive read-lock");
         printk("             |");
-        dotest(rlock_AA1, SUCCESS, LOCKTYPE_RWLOCK);
+        dotest(rlock_AA1, FAILURE, LOCKTYPE_RWLOCK);
         printk("             |");
         dotest(rsem_AA1, FAILURE, LOCKTYPE_RWSEM);
         printk("\n");
 
         print_testname("recursive read-lock #2");
         printk("             |");
-        dotest(rlock_AA1B, SUCCESS, LOCKTYPE_RWLOCK);
+        dotest(rlock_AA1B, FAILURE, LOCKTYPE_RWLOCK);
         printk("             |");
         dotest(rsem_AA1B, FAILURE, LOCKTYPE_RWSEM);
         printk("\n");
@@ -1856,6 +1883,21 @@ void locking_selftest(void)
         dotest(rsem_AA3, FAILURE, LOCKTYPE_RWSEM);
         printk("\n");
 
+        print_testname("recursive rlock with interrupt");
+        printk("             |");
+        dotest(rlock_AHA1, SUCCESS, LOCKTYPE_RWLOCK);
+        printk("\n");
+
+        print_testname("recursive rlock with interrupt #2");
+        printk("             |");
+        dotest(rlock_AHA1B, SUCCESS, LOCKTYPE_RWLOCK);
+        printk("\n");
+
+        print_testname("recursive rlock with interrupt #3");
+        printk("             |");
+        dotest(rlock_ASAHA1, SUCCESS, LOCKTYPE_RWLOCK);
+        printk("\n");
+
         printk("  --------------------------------------------------------------------------\n");
 
         /*