Re: [PATCH] mm: thp: Deny THP for guest_memfd and secretmem in file_thp_enabled()

[Deepanshu Kartikey]

On Wed, Feb 11, 2026 at 2:58 PM David Hildenbrand (Arm)
<david@xxxxxxxxxx> wrote:
>

>
> What about the following:
>
> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> index 44ff8a648afd..9fbe5c28a6bc 100644
> --- a/mm/huge_memory.c
> +++ b/mm/huge_memory.c
> @@ -94,6 +94,9 @@ static inline bool file_thp_enabled(struct vm_area_struct *vma)
>
>          inode = file_inode(vma->vm_file);
>
> +       if (IS_ANON_FILE(inode))
> +               return false;
> +
>          return !inode_is_open_for_write(inode) && S_ISREG(inode->i_mode);
>   }
>

This is an elegant solution. Instead of depending on specific subsystems,
IS_ANON_FILE() handles all pseudo-filesystem inodes generically, so any
future pseudo-fs won't run into the same issue.