Hello,
On (11/20/15 12:31), Vladimir Davydov wrote:
[..]
> - if (ptep_clear_flush_young_notify(vma, address, pte)) {
> - /*
> - * Don't treat a reference through a sequentially read
> - * mapping as such. If the page has been used in
> - * another mapping, we will catch it; if this other
> - * mapping is already gone, the unmap path will have
> - * set PG_referenced or activated the page.
> - */
> - if (likely(!(vma->vm_flags & VM_SEQ_READ)))
> + if (pte) {
> + if (ptep_clear_flush_young_notify(vma, address, pte)) {
> + /*
> + * Don't treat a reference through a sequentially read
> + * mapping as such. If the page has been used in
> + * another mapping, we will catch it; if this other
> + * mapping is already gone, the unmap path will have
> + * set PG_referenced or activated the page.
> + */
> + if (likely(!(vma->vm_flags & VM_SEQ_READ)))
> + referenced++;
> + }
> + pte_unmap(pte);
> + } else {
> + if (pmdp_clear_flush_young_notify(vma, address, pmd))
> referenced++;
> }
# CONFIG_TRANSPARENT_HUGEPAGE is not set
x86_64, 4.4.0-rc2-mm1
mm/built-in.o: In function `page_referenced_one':
rmap.c:(.text+0x32070): undefined reference to `pmdp_clear_flush_young'
-ss
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