forked from luck/tmp_suning_uos_patched
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>
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@ -118,6 +118,41 @@ static int test_mutex(void)
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return 0;
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}
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static int test_aa(void)
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{
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struct ww_mutex mutex;
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struct ww_acquire_ctx ctx;
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int ret;
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ww_mutex_init(&mutex, &ww_class);
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ww_acquire_init(&ctx, &ww_class);
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ww_mutex_lock(&mutex, &ctx);
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if (ww_mutex_trylock(&mutex)) {
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pr_err("%s: trylocked itself!\n", __func__);
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ww_mutex_unlock(&mutex);
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ret = -EINVAL;
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goto out;
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}
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ret = ww_mutex_lock(&mutex, &ctx);
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if (ret != -EALREADY) {
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pr_err("%s: missed deadlock for recursing, ret=%d\n",
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__func__, ret);
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if (!ret)
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ww_mutex_unlock(&mutex);
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ret = -EINVAL;
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goto out;
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}
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ret = 0;
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out:
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ww_mutex_unlock(&mutex);
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ww_acquire_fini(&ctx);
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return ret;
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}
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static int __init test_ww_mutex_init(void)
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{
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int ret;
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@ -126,6 +161,10 @@ static int __init test_ww_mutex_init(void)
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if (ret)
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return ret;
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ret = test_aa();
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if (ret)
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return ret;
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return 0;
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}
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