On Tue, Jan 11, 2022 at 04:33:30PM +0100, Arnd Bergmann wrote: > This is a very subtle change to the exported UAPI header contents: > On 64-bit architectures, the three unusable numbers are now always > shown, rather than depending on a user-controlled symbol. Well, the change is bigger and less subtle. Before this change the constants were never visible to userspace at all (except on mips), because the #ifdef CONFIG_64BIT it never set for userspace builds. > This is probably what we want here for compatibility reasons, but I think > it should be explained in the changelog text, and I'd like Jeff or Bruce > to comment on it as well: the alternative here would be to make the > uapi definition depend on __BITS_PER_LONG==32, which is > technically the right thing to do but more a of a change. I can change this to #if __BITS_PER_LONG==32 || defined(__KERNEL__), but it will still be change in what userspace sees.
