[PATCH v5 01/13] arm64: mm: Map the linear alias of text/rodata as tagged

[Ard Biesheuvel]

From: Ard Biesheuvel <ardb at kernel.org>

Before moving the empty_zero_page into the .rodata section, make
sure its linear alias has the memory-tagged type. This is needed to
ensure that cpu_enable_mte() will be able to initialize the tags
correctly.

Signed-off-by: Ard Biesheuvel <ardb at kernel.org>
---
 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..0c3d97f120e1 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -1195,7 +1195,7 @@ static void __init map_mem(pgd_t *pgdp)
 	 * so we should avoid them here.
 	 */
 	__map_memblock(pgdp, kernel_start, kernel_end,
-		       PAGE_KERNEL, NO_CONT_MAPPINGS);
+		       pgprot_tagged(PAGE_KERNEL), NO_CONT_MAPPINGS);
 	memblock_clear_nomap(kernel_start, kernel_end - kernel_start);
 	arm64_kfence_map_pool(early_kfence_pool, pgdp);
 }
-- 
2.54.0.563.g4f69b47b94-goog