On Thu, 6 Apr 2023 at 09:40, Muhammad Usama Anjum
<usama.anjum@xxxxxxxxxxxxx> wrote:
[...]
> --- a/fs/proc/task_mmu.c
> +++ b/fs/proc/task_mmu.c
[...]
> +static int pagemap_scan_pmd_entry(pmd_t *pmd, unsigned long start,
> + unsigned long end, struct mm_walk *walk)
> +{
> + struct pagemap_scan_private *p = walk->private;
> + bool is_written, is_file, is_present, is_swap;
> + struct vm_area_struct *vma = walk->vma;
> + unsigned long addr = end;
> + spinlock_t *ptl;
> + int ret = 0;
> + pte_t *pte;
> +
> +#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> + ptl = pmd_trans_huge_lock(pmd, vma);
> + if (ptl) {
[...]
> + return ret;
> + }
> +process_smaller_pages:
> + if (pmd_trans_unstable(pmd))
> + return 0;
Why pmd_trans_unstable() is needed here and not only after split_huge_pmd()?
Best regards
Michał Mirosław
