On Wed, Nov 04, 2015 at 11:29:51AM +0900, Sergey Senozhatsky wrote:
> On (11/04/15 10:25), Minchan Kim wrote:
> [..]
> > +static int madvise_free_pte_range(pmd_t *pmd, unsigned long addr,
> > +                           unsigned long end, struct mm_walk *walk)
> > +
> > +{
> > +   struct mmu_gather *tlb = walk->private;
> > +   struct mm_struct *mm = tlb->mm;
> > +   struct vm_area_struct *vma = walk->vma;
> > +   spinlock_t *ptl;
> > +   pte_t *pte, ptent;
> > +   struct page *page;
> 
> 
> I'll just ask (probably I'm missing something)
> 
>       + pmd_trans_huge_lock() ?

No. It would be deadlock.

> 
> > +   split_huge_page_pmd(vma, addr, pmd);
> > +   if (pmd_trans_unstable(pmd))
> > +           return 0;
> > +
> > +   pte = pte_offset_map_lock(mm, pmd, addr, &ptl);
> > +   arch_enter_lazy_mmu_mode();
> > +   for (; addr != end; pte++, addr += PAGE_SIZE) {
> > +           ptent = *pte;
> > +
> > +           if (!pte_present(ptent))
> > +                   continue;
> > +
> > +           page = vm_normal_page(vma, addr, ptent);
> > +           if (!page)
> > +                   continue;
> > +
> 
>       -ss
> 
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