mm: thp: set the accessed flag for old pages on access fault

[pandora-kernel.git] / mm / huge_memory.c

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index a47b45d..9a33a2b 100644 (file)
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -790,6 +790,28 @@ pgtable_t get_pmd_huge_pte(struct mm_struct *mm)
        return pgtable;
 }
 
        return pgtable;
 }
 

+void huge_pmd_set_accessed(struct mm_struct *mm,
+                          struct vm_area_struct *vma,
+                          unsigned long address,
+                          pmd_t *pmd, pmd_t orig_pmd,
+                          int dirty)
+{
+       pmd_t entry;
+       unsigned long haddr;
+
+       spin_lock(&mm->page_table_lock);
+       if (unlikely(!pmd_same(*pmd, orig_pmd)))
+               goto unlock;
+
+       entry = pmd_mkyoung(orig_pmd);
+       haddr = address & HPAGE_PMD_MASK;
+       if (pmdp_set_access_flags(vma, haddr, pmd, entry, dirty))
+               update_mmu_cache_pmd(vma, address, pmd);
+
+unlock:
+       spin_unlock(&mm->page_table_lock);
+}
+

 static int do_huge_pmd_wp_page_fallback(struct mm_struct *mm,
                                        struct vm_area_struct *vma,
                                        unsigned long address,
 static int do_huge_pmd_wp_page_fallback(struct mm_struct *mm,
                                        struct vm_area_struct *vma,
                                        unsigned long address,