linux-kernel - [PATCH 2/2 v6] locking/selftest: Support queued rwlock

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Message-Id: <1406659999-13974-3-git-send-email-Waiman.Long@hp.com>
Date:	Tue, 29 Jul 2014 14:53:19 -0400
From:	Waiman Long <Waiman.Long@...com>
To:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Maarten Lankhorst <maarten.lankhorst@...onical.com>,
	Rik van Riel <riel@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Scott J Norton <scott.norton@...com>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Waiman Long <Waiman.Long@...com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH 2/2 v6] 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@...com>
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
---
 lib/locking-selftest.c |   12 ++++++------
 1 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/lib/locking-selftest.c b/lib/locking-selftest.c
index 872a15a..9a33688 100644
--- a/lib/locking-selftest.c
+++ b/lib/locking-selftest.c
@@ -267,19 +267,19 @@ GENERATE_TESTCASE(AA_rsem)
 #undef E
 
 /*
- * Special-case for read-locking, they are
+ * Special-case for read-locking, they are not
  * allowed to recurse on the same lock class:
  */
 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 rsem_AA1(void)
@@ -1069,7 +1069,7 @@ 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 +1830,14 @@ 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");
-- 
1.7.1

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