On Thu, Nov 19, 2020 at 03:29:43PM +0000, Pavel Begunkov wrote: > The problem here is that iov_iter_is_*() helpers check types for > equality, but all iterate_* helpers do bitwise ands. This confuses > a compiler, so even if some cases were handled separately with > iov_iter_is_*(), it can't eliminate and skip unreachable branches in > following iterate*(). I think we need to kill the iov_iter_is_* helpers, renumber to not do the pointless bitmask and just check for equality (might turn into a bunch of nice switch statements actually).
