On arm64, the zero page receives special treatment by having the tagged flag set on MTE initialization, not when the page is mapped in a process address space. Reserve the corresponding tag block when tag storage is being activated. Signed-off-by: Alexandru Elisei <alexandru.elisei@xxxxxxx> --- arch/arm64/kernel/mte_tag_storage.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm64/kernel/mte_tag_storage.c b/arch/arm64/kernel/mte_tag_storage.c index 7dff93492a7b..1ab875be5f9b 100644 --- a/arch/arm64/kernel/mte_tag_storage.c +++ b/arch/arm64/kernel/mte_tag_storage.c @@ -398,6 +398,8 @@ static int __init mte_tag_storage_activate_regions(void) } } + ret = reserve_metadata_storage(ZERO_PAGE(0), 0, GFP_HIGHUSER_MOVABLE); + return ret; } core_initcall(mte_tag_storage_activate_regions); -- 2.41.0
