On Fri, Aug 05, 2022 at 01:03:28PM +0200, David Hildenbrand wrote: > diff --git a/mm/mmap.c b/mm/mmap.c > index 61e6135c54ef..462a6b0344ac 100644 > --- a/mm/mmap.c > +++ b/mm/mmap.c > @@ -1683,6 +1683,13 @@ int vma_wants_writenotify(struct vm_area_struct *vma, pgprot_t vm_page_prot) > if ((vm_flags & (VM_WRITE|VM_SHARED)) != ((VM_WRITE|VM_SHARED))) > return 0; > > + /* > + * Hugetlb does not require/support writenotify; especially, it does not > + * support softdirty tracking. > + */ > + if (is_vm_hugetlb_page(vma)) > + return 0; I'm kind of confused here.. you seems to be fixing up soft-dirty for hugetlb but here it's explicitly forbidden. Could you explain a bit more on why this patch is needed if (assume there'll be a working) patch 2 being provided? Thanks, -- Peter Xu
