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spin_is_locked() always returns false for uniprocessor configurations in several architectures, so do not use WARN_ON with it. Use lockdep_assert_held() instead to also reduce overhead in non-debug kernels. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Cc: <stable@vger.kernel.org> Signed-off-by: Matt Fleming <matt.fleming@intel.com>