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SubjectRe: 2.6.22-rc4-mm1

While writing memory unplug, I noticed this code.
static int
fixup_anon_page(pte_t *pte, unsigned long start, unsigned long end, void *priv)
struct vm_area_struct *vma = priv;
struct page *page = vm_normal_page(vma, start, *pte);

if (page && PageAnon(page))
page->index = linear_page_index(vma, start);

return 0;

static int fixup_anon_pages(struct vm_area_struct *vma)
struct mm_walk walk = {
.pte_entry = fixup_anon_page,

return walk_page_range(vma->vm_mm,
vma->vm_start, vma->vm_end, &walk, vma);

I think that 'pte' passed to fixup_anon_page() by walk_page_range()
is not guaranteed to be 'Present'.

Then, vm_normal_page() will show print_bad_pte().

If this never occur now, I'll add my own check code for memory migration by kernel here.

(Sorry, I can't find who should be CCed.)


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