1 files changed, 18 insertions, 4 deletions

diff --git a/include/asm-x86/pgalloc_32.h b/include/asm-x86/pgalloc_32.h
index 3482c3427897..0caa37a9a25f 100644
--- a/include/asm-x86/pgalloc_32.h
+++ b/include/asm-x86/pgalloc_32.h
@@ -63,21 +63,35 @@ static inline void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte)
  */
 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
 {
-        BUG();
-        return (pmd_t *)2;
+        return (pmd_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
 }
 
 static inline void pmd_free(pmd_t *pmd)
 {
+        BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
+        free_page((unsigned long)pmd);
 }
 
 static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd)
 {
+        paravirt_release_pd(__pa(pmd) >> PAGE_SHIFT);
+        tlb_remove_page(tlb, virt_to_page(pmd));
 }
 
-static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
+static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd)
 {
-        BUG();
+        paravirt_alloc_pd(mm, __pa(pmd) >> PAGE_SHIFT);
+
+        /* Note: almost everything apart from _PAGE_PRESENT is
+           reserved at the pmd (PDPT) level. */
+        set_pud(pudp, __pud(__pa(pmd) | _PAGE_PRESENT));
+
+        /*
+         * Pentium-II erratum A13: in PAE mode we explicitly have to flush
+         * the TLB via cr3 if the top-level pgd is changed...
+         */
+        if (mm == current->active_mm)
+                write_cr3(read_cr3());
 }
 #endif  /* CONFIG_X86_PAE */