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locking/ww_mutex: Add kselftests for ww_mutex AA deadlock detection 

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Maarten Lankhorst <dev@mblankhorst.nl>
Cc: Nicolai Hähnle <nhaehnle@gmail.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/20161201114711.28697-5-chris@chris-wilson.co.uk
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Chris Wilson 2016-12-01 11:47:07 +00:00 committed by Ingo Molnar
parent f2a5fec173
commit c22fb3807f
1 changed files with 39 additions and 0 deletions
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39
kernel/locking/test-ww_mutex.c
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@ -118,6 +118,41 @@ static int test_mutex(void)
return 0;
}
static int test_aa(void)
{
struct ww_mutex mutex;
struct ww_acquire_ctx ctx;
int ret;
ww_mutex_init(&mutex, &ww_class);
ww_acquire_init(&ctx, &ww_class);
ww_mutex_lock(&mutex, &ctx);
if (ww_mutex_trylock(&mutex)) {
pr_err("%s: trylocked itself!\n", __func__);
ww_mutex_unlock(&mutex);
ret = -EINVAL;
goto out;
}
ret = ww_mutex_lock(&mutex, &ctx);
if (ret != -EALREADY) {
pr_err("%s: missed deadlock for recursing, ret=%d\n",
__func__, ret);
if (!ret)
ww_mutex_unlock(&mutex);
ret = -EINVAL;
goto out;
}
ret = 0;
out:
ww_mutex_unlock(&mutex);
ww_acquire_fini(&ctx);
return ret;
}
static int __init test_ww_mutex_init(void)
{
int ret;
@ -126,6 +161,10 @@ static int __init test_ww_mutex_init(void)
if (ret)
return ret;
ret = test_aa();
if (ret)
return ret;
return 0;
}