On Fri, Jun 09, 2023 at 09:35:49PM +0100, Matthew Wilcox wrote:
> On Fri, Jun 09, 2023 at 04:25:42PM -0400, Peter Xu wrote:
> > > bool __folio_lock_or_retry(struct folio *folio, struct mm_struct *mm,
> > > unsigned int flags)
> > > {
> > > + /* Can't do this if not holding mmap_lock */
> > > + if (flags & FAULT_FLAG_VMA_LOCK)
> > > + return false;
> >
> > If here what we need is the page lock, can we just conditionally release
> > either mmap lock or vma lock depending on FAULT_FLAG_VMA_LOCK?
>
> See patch 5 ...
Just reaching.. :)
Why not in one shot, then?
--
Peter Xu
