On Sun, Oct 18, 2026 at 08:01:30PM +0200, Jan Koester wrote: > Make kuid_t and kgid_t (and vfsuid_t and vfsgid_t, which share their > layout) tagged unions: a classic 32 bit id, an RFC 9562 UUID, or a > Microsoft GUID. KID_LEGACY is 0, so zeroed memory still holds the root > ids, and KUIDT_INIT()/KGIDT_INIT() keep building classic ids, so the > bulk of the kernel needs no change. The member is renamed from val to > legacy so the compiler finds code that peeks at it directly.
Most Linux systems aren't going to want this bloat to the core uid and gid types. So if this is supported at all (unclear it's worth it...), it will need to be controlled by a default-off kconfig option. Side note: the subject line says the series contains 41 patches, but it seems only 11 were actually sent. - Eric
