Re: [PATCH] hugetlbfs: add MTE support
From: Andrew Morton
Date: Wed Jun 26 2024 - 16:44:19 EST
On Tue, 25 Jun 2024 16:37:17 -0700 Yang Shi <yang@xxxxxxxxxxxxxxxxxxxxxx> 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?