Hi Kevin, On Tue, 28 Apr 2026, at 16:16, Kevin Brodsky wrote: > On 27/04/2026 17:34, Ard Biesheuvel wrote: >> From: Ard Biesheuvel <[email protected]> >> >> Before moving the empty_zero_page into the __ro_after_init section, make >> sure it has the memory-tagged type. This is needed to ensure that >> cpu_enable_mte() will be able to initialize the tags correctly. > > mark_linear_text_alias_ro() is called after all features have been > detected and enabled, so do we actually need this? > > AFAICT the lines that matter for cpu_enable_mte() are those, in map_mem(): > > __map_memblock(pgdp, kernel_start, kernel_end, > PAGE_KERNEL, NO_CONT_MAPPINGS); > > It is probably this call that needs to be changed to use > pgprot_tagged(PAGE_KERNEL). >
I see. I guess we should probably update both, no?
