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SubjectRe: [PATCHv4 19/24] thp, mm: use migration entries to freeze page counts on split
Date
....
....
+static void freeze_page(struct anon_vma *anon_vma, struct page *page)
> +{
> + struct anon_vma_chain *avc;
> + struct vm_area_struct *vma;
> + pgoff_t pgoff = page->index << (PAGE_CACHE_SHIFT - PAGE_SHIFT);

So this get called only with head page, We also do
BUG_ON(PageTail(page)) in the caller. But


> + unsigned long addr, haddr;
> + unsigned long mmun_start, mmun_end;
> + pgd_t *pgd;
> + pud_t *pud;
> + pmd_t *pmd;
> + pte_t *start_pte, *pte;
> + spinlock_t *ptl;
......


> +
> +static void unfreeze_page(struct anon_vma *anon_vma, struct page *page)
> +{
> + struct anon_vma_chain *avc;
> + pgoff_t pgoff = page_to_pgoff(page);

Why ? Can this get called for tail pages ?


-aneesh



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