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Groups > linux.kernel > #1590924

[tip:locking/urgent] locking/ww_mutex: Adjust the lock number for stress test

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Commit-ID:  857811a37129f5d2ba162d7be3986eff44724014
Gitweb:     http://git.kernel.org/tip/857811a37129f5d2ba162d7be3986eff44724014
Author:     Boqun Feng <boqun.feng@gmail.com>
AuthorDate: Wed, 1 Mar 2017 23:01:38 +0800
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Thu, 2 Mar 2017 09:00:39 +0100

locking/ww_mutex: Adjust the lock number for stress test

Because there are only 12 bits in held_lock::references, so we only
support 4095 nested lock held in the same time, adjust the lock number
for ww_mutex stress test to kill one lockdep splat:

  [ ] [ BUG: bad unlock balance detected! ]
  [ ] kworker/u2:0/5 is trying to release lock (ww_class_mutex) at:
  [ ] ww_mutex_unlock()
  [ ] but there are no more locks to release!
  ...

Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Fengguang Wu <fengguang.wu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Nicolai Hähnle <Nicolai.Haehnle@amd.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20170301150138.hdixnmafzfsox7nn@tardis.cn.ibm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 kernel/locking/test-ww_mutex.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/locking/test-ww_mutex.c b/kernel/locking/test-ww_mutex.c
index 3eb39c5..6b7abb3 100644
--- a/kernel/locking/test-ww_mutex.c
+++ b/kernel/locking/test-ww_mutex.c
@@ -627,7 +627,7 @@ static int __init test_ww_mutex_init(void)
 	if (ret)
 		return ret;
 
-	ret = stress(4096, hweight32(STRESS_ALL)*ncpus, 1<<12, STRESS_ALL);
+	ret = stress(4095, hweight32(STRESS_ALL)*ncpus, 1<<12, STRESS_ALL);
 	if (ret)
 		return ret;
 

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Re: [locking/ww_mutex] 2a0c112828 WARNING: CPU: 0 PID: 18 at  kernel/locking/mutex.c:305 __ww_mutex_wakeup_for_backoff Boqun Feng <boqun.feng@gmail.com> - 2017-03-01 16:10 +0100
  Re: [locking/ww_mutex] 2a0c112828 WARNING: CPU: 0 PID: 18 at  kernel/locking/mutex.c:305 __ww_mutex_wakeup_for_backoff Peter Zijlstra <peterz@infradead.org> - 2017-03-01 16:20 +0100
  Re: [locking/ww_mutex] 2a0c112828 WARNING: CPU: 0 PID: 18 at  kernel/locking/mutex.c:305 __ww_mutex_wakeup_for_backoff Peter Zijlstra <peterz@infradead.org> - 2017-03-01 17:00 +0100
    Re: [locking/ww_mutex] 2a0c112828 WARNING: CPU: 0 PID: 18 at  kernel/locking/mutex.c:305 __ww_mutex_wakeup_for_backoff Chris Wilson <chris@chris-wilson.co.uk> - 2017-03-01 17:20 +0100
      Re: [locking/ww_mutex] 2a0c112828 WARNING: CPU: 0 PID: 18 at  kernel/locking/mutex.c:305 __ww_mutex_wakeup_for_backoff Chris Wilson <chris@chris-wilson.co.uk> - 2017-03-01 17:30 +0100
        Re: [locking/ww_mutex] 2a0c112828 WARNING: CPU: 0 PID: 18 at  kernel/locking/mutex.c:305 __ww_mutex_wakeup_for_backoff Fengguang Wu <fengguang.wu@intel.com> - 2017-03-01 18:50 +0100
        Re: [locking/ww_mutex] 2a0c112828 WARNING: CPU: 0 PID: 18 at  kernel/locking/mutex.c:305 __ww_mutex_wakeup_for_backoff Peter Zijlstra <peterz@infradead.org> - 2017-03-01 22:50 +0100
  Re: [locking/ww_mutex] 2a0c112828 WARNING: CPU: 0 PID: 18 at  kernel/locking/mutex.c:305 __ww_mutex_wakeup_for_backoff Peter Zijlstra <peterz@infradead.org> - 2017-03-01 17:00 +0100
    Re: [locking/ww_mutex] 2a0c112828 WARNING: CPU: 0 PID: 18 at  kernel/locking/mutex.c:305 __ww_mutex_wakeup_for_backoff Fengguang Wu <fengguang.wu@intel.com> - 2017-03-01 17:00 +0100
  [tip:locking/urgent] locking/ww_mutex: Adjust the lock number for  stress test tip-bot for Boqun Feng <tipbot@zytor.com> - 2017-03-02 09:50 +0100

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