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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