https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115172
--- Comment #3 from Uroš Bizjak <ubizjak at gmail dot com> --- (In reply to Jakub Jelinek from comment #1) > What the kernel does is terrible, why they just don't declare the extern > with __seg_gs attribute? This is how kernel currently handles percpu variables. They are redefined to a named address space just before use, because the percpu infrastructure can't handle AS qualified variables, mainly due to the extensive use of __typeof__, please see [1]. The solution is to use __typeof_unqual__ with gcc-14. The prototype patch at [2] declares percpu variables as __seg_gs during decl time, as you proposed above. [1] https://lore.kernel.org/lkml/87bk7ux4e9.ffs@tglx/ [2] https://lore.kernel.org/lkml/cafuld4z-sthtu2uwv02s+nbx51qqytguo8zew50fc_pbsff...@mail.gmail.com/
