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). - Kevin > Signed-off-by: Ard Biesheuvel <[email protected]> > --- > arch/arm64/mm/mmu.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c > index dd85e093ffdb..f084993024ab 100644 > --- a/arch/arm64/mm/mmu.c > +++ b/arch/arm64/mm/mmu.c > @@ -1049,7 +1049,7 @@ void __init mark_linear_text_alias_ro(void) > */ > update_mapping_prot(__pa_symbol(_text), (unsigned long)lm_alias(_text), > (unsigned long)__init_begin - (unsigned long)_text, > - PAGE_KERNEL_RO); > + pgprot_tagged(PAGE_KERNEL_RO)); > } > > #ifdef CONFIG_KFENCE
