[PATCH] hugetlbfs: add MTE support

[Andrew Morton]

On Tue, 25 Jun 2024 16:37:17 -0700 Yang Shi <yang at os.amperecomputing.com> wrote:

> MTE can be supported on ram based filesystem. It is supported on tmpfs.
> There is use case to use MTE on hugetlbfs as well, adding MTE support.
> 
> --- a/fs/hugetlbfs/inode.c
> +++ b/fs/hugetlbfs/inode.c
> @@ -110,7 +110,7 @@ static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma)
>  	 * way when do_mmap unwinds (may be important on powerpc
>  	 * and ia64).
>  	 */
> -	vm_flags_set(vma, VM_HUGETLB | VM_DONTEXPAND);
> +	vm_flags_set(vma, VM_HUGETLB | VM_DONTEXPAND | VM_MTE_ALLOWED);
>  	vma->vm_ops = &hugetlb_vm_ops;
>  
>  	ret = seal_check_write(info->seals, vma);

How thoroughly has this been tested?

Can we expect normal linux-next testing to exercise this, or must
testers make special arangements to get the coverage?