I reviewed this patch and didn't find any justification for performance claim, can you please provide us numbers before/after so we will be able to decide based on reliable data? It will help us to review our drivers and improve them even more.
I don't see any reason to find evidence in justification here. It's a fastpath call, which is unlikely to fail, and these macros are considered common practice. There is no reason to make Max to go and quantify a micro-optimization.
