[tip:locking/core] locking/lockdep/selftests: Fix mixed read-write ABBA tests

tip-bot for Peter Zijlstra
2017-08-29T14:28:44Z

Commit-ID: d82fed75294229abc9d757f08a4817febae6c4f4
Gitweb: http://git.kernel.org/tip/d82fed75294229abc9d757f08a4817febae6c4f4
Author: Peter Zijlstra <peterz@infradead.org>
AuthorDate: Mon, 28 Aug 2017 14:42:45 +0200
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 29 Aug 2017 15:15:17 +0200

locking/lockdep/selftests: Fix mixed read-write ABBA tests

Commit:

e91498589746 ("locking/lockdep/selftests: Add mixed read-write ABBA tests")

adds an explicit FAILURE to the locking selftest but overlooked the
fact that this kills lockdep. Fudge the test to avoid this.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: hpa@zytor.com
Link: http://lkml.kernel.org/r/20170828124245.xlo2yshxq2btgmuf@hirez.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
lib/locking-selftest.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/lib/locking-selftest.c b/lib/locking-selftest.c
index 3c7151a..cd0b5c9 100644
--- a/lib/locking-selftest.c
+++ b/lib/locking-selftest.c
@@ -2031,6 +2031,12 @@ void locking_selftest(void)
print_testname("mixed read-lock/lock-write ABBA");
pr_cont(" |");
dotest(rlock_ABBA1, FAILURE, LOCKTYPE_RWLOCK);
+ /*
+ * Lockdep does indeed fail here, but there's nothing we can do about
+ * that now. Don't kill lockdep for it.
+ */
+ unexpected_testcase_failures--;
+
pr_cont(" |");
dotest(rwsem_ABBA1, FAILURE, LOCKTYPE_RWSEM);