On Tue, Feb 26, 2019 at 06:28:45AM -0800, Paul E. McKenney wrote: > I must confess to not being all that sympathetic to code that takes > advantage of happenstance stack-frame layout. Is there some reason > we need that? Not that I'm aware; but if it gets this 'obvious' case wrong, I worry what else it gets wrong. At the very least we should get this fixed and compile a kernel with the fixed compiler to see what (if anything) changes in the generated code and analyse the changes (if any) to make sure we were ok (or not). I mean; yes that example is UB, but the result is also clearly batshit insane.
