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Date: Wed, 3 Apr 2024 18:34:12 -0700
From: Jakub Kicinski <kuba@kernel.org>
To: Guenter Roeck <linux@roeck-us.net>
Cc: linux-kselftest@vger.kernel.org, David Airlie <airlied@gmail.com>, Arnd
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Subject: Re: [PATCH v3 06/15] net: kunit: Suppress lock warning noise at end
 of dev_addr_lists tests
Message-ID: <20240403183412.16254318@kernel.org>
In-Reply-To: <20240403131936.787234-7-linux@roeck-us.net>
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On Wed,  3 Apr 2024 06:19:27 -0700 Guenter Roeck wrote:
> dev_addr_lists_test generates lock warning noise at the end of tests
> if lock debugging is enabled. There are two sets of warnings.
> 
> WARNING: CPU: 0 PID: 689 at kernel/locking/mutex.c:923 __mutex_unlock_slowpath.constprop.0+0x13c/0x368
> DEBUG_LOCKS_WARN_ON(__owner_task(owner) != __get_current())
> 
> WARNING: kunit_try_catch/1336 still has locks held!
> 
> KUnit test cleanup is not guaranteed to run in the same thread as the test
> itself. For this test, this means that rtnl_lock() and rtnl_unlock() may
> be called from different threads. This triggers the warnings.
> Suppress the warnings because they are irrelevant for the test and just
> confusing and distracting.
> 
> The first warning can be suppressed by using START_SUPPRESSED_WARNING()
> and END_SUPPRESSED_WARNING() around the call to rtnl_unlock(). To suppress
> the second warning, it is necessary to set debug_locks_silent while the
> rtnl lock is held.

Is it okay if I move the locking into the tests, instead?
It's only 4 lines more and no magic required, seems to work fine.