On Thu, Jul 06, 2017 at 11:44:49PM +0200, Christoph Hellwig wrote: > > Which sparse version are you using and what's your .config? > > sparse is v0.5.0-62-gce18a90, .config is attached. Arrgh... OK, I see what's going on. sparse commit affecting that is "Allow casting to a restricted type if !restricted_value"; it allows the things like (__le32)0. It's present in sparse.git, but not in chrisl/sparse.git, which is what you are using. Anyway, the thing I'd missed kernel-side is this: #define __TYPE_IS_L(t) (__same_type((t)0, 0L)) #define __TYPE_IS_UL(t) (__same_type((t)0, 0UL)) #define __TYPE_IS_LL(t) (__same_type((t)0, 0LL) || __same_type((t)0, 0ULL)) Let's turn them into #define __TYPE_AS(t, v) __same_type((__force t)0, v) #define __TYPE_IS_L(t) (__TYPE_AS(t, 0L)) #define __TYPE_IS_UL(t) (__TYPE_AS(t, 0UL)) #define __TYPE_IS_LL(t) (__TYPE_AS(t, 0LL) || __TYPE_AS(t, 0ULL)) That should do it both for old and for new versions of sparse.
