On Fri, Jan 08, 2021 at 05:15:16PM +0000, Will Deacon wrote:
> diff --git a/mm/filemap.c b/mm/filemap.c
> index c1f2dc89b8a7..0fb9d1714797 100644
> --- a/mm/filemap.c
> +++ b/mm/filemap.c
> @@ -3051,14 +3051,18 @@ vm_fault_t filemap_map_pages(struct vm_fault *vmf,
> if (!pte_none(*vmf->pte))
> goto unlock;
>
> + /* We're about to handle the fault */
> + if (vmf->address == address) {
> + vmf->flags &= ~FAULT_FLAG_PREFAULT;
> + ret = VM_FAULT_NOPAGE;
> + } else {
> + vmf->flags |= FAULT_FLAG_PREFAULT;
> + }
> +
Do we need to restore the oririnal status of the bit once we are done?
--
Kirill A. Shutemov
