arm64: hugetlb: Fix handling of young ptes

In the contiguous bit hugetlb break-before-make code we assume that all
hugetlb pages are young.

In fact, remove_migration_pte is able to place an old hugetlb pte so
this assumption is not valid.

This patch fixes the contiguous hugetlb scanning code to preserve young
ptes.

Fixes: d8bdcff28764 ("arm64: hugetlb: Add break-before-make logic for contiguous entries")
Signed-off-by: Steve Capper <steve.capper@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
index 192b3ba..f85be2f 100644 (file)
--- a/arch/arm64/mm/hugetlbpage.c
+++ b/arch/arm64/mm/hugetlbpage.c
@@ -117,11 +117,14 @@ static pte_t get_clear_flush(struct mm_struct *mm,
 
                /*
                 * If HW_AFDBM is enabled, then the HW could turn on
-                * the dirty bit for any page in the set, so check
-                * them all.  All hugetlb entries are already young.
+                * the dirty or accessed bit for any page in the set,
+                * so check them all.
                 */
                if (pte_dirty(pte))
                        orig_pte = pte_mkdirty(orig_pte);
+
+               if (pte_young(pte))
+                       orig_pte = pte_mkyoung(orig_pte);
        }
 
        if (valid) {
@@ -340,10 +343,13 @@ int huge_ptep_set_access_flags(struct vm_area_struct *vma,
        if (!pte_same(orig_pte, pte))
                changed = 1;
 
-       /* Make sure we don't lose the dirty state */
+       /* Make sure we don't lose the dirty or young state */
        if (pte_dirty(orig_pte))
                pte = pte_mkdirty(pte);
 
+       if (pte_young(orig_pte))
+               pte = pte_mkyoung(pte);
+
        hugeprot = pte_pgprot(pte);
        for (i = 0; i < ncontig; i++, ptep++, addr += pgsize, pfn += dpfn)
                set_pte_at(vma->vm_mm, addr, ptep, pfn_pte(pfn, hugeprot));