From patch https://bugs.webkit.org/attachment.cgi?id=129676, check-webkit-style complained about the following: if (condition) { { MutexLocker locker(m_mutex); doSomeThings(); } doOtherThings(); } Source/WebCore/platform/graphics/blackberry/LayerTiler.cpp:160: This { should be at the end of the previous line [whitespace/braces] [4] This is a false positive. The second '{' is used to scope the MutexLocker, it should not be at the end of the previous line.