Re: [PATCH] mm: Track page table modifications in __apply_to_page_range() construction

On Fri, Aug 21, 2020 at 12:38:03PM +0100, Chris Wilson wrote:

In the version I tested, I also had

@@ -2216,7 +2216,7 @@ static int apply_to_pte_range(struct mm_struct *mm, pmd_t *pmd,

    if (create) {
            pte = (mm == &init_mm) ?

•                   pte_alloc_kernel(pmd, addr) :
  

•                   pte_alloc_kernel_track(pmd, addr, mask) :
                    pte_alloc_map_lock(mm, pmd, addr, &ptl);
            if (!pte)
                    return -ENOMEM;
  
  

And that PGTBL_PMD_MODIFIED makes a difference.

Right, thanks. Added that too.