1 files changed, 28 insertions, 6 deletions

diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c
index 1bd51d840484..fb9c5a85aa56 100644
--- a/arch/s390/mm/vmem.c
+++ b/arch/s390/mm/vmem.c
@@ -73,6 +73,8 @@ static void __init_refok *vmem_alloc_pages(unsigned int order)
         return alloc_bootmem_pages((1 << order) * PAGE_SIZE);
 }
 
+#define vmem_pud_alloc()        ({ BUG(); ((pud_t *) NULL); })
+
 static inline pmd_t *vmem_pmd_alloc(void)
 {
         pmd_t *pmd = NULL;
@@ -103,6 +105,7 @@ static int vmem_add_range(unsigned long start, unsigned long size)
 {
         unsigned long address;
         pgd_t *pg_dir;
+        pud_t *pu_dir;
         pmd_t *pm_dir;
         pte_t *pt_dir;
         pte_t  pte;
@@ -111,13 +114,21 @@ static int vmem_add_range(unsigned long start, unsigned long size)
         for (address = start; address < start + size; address += PAGE_SIZE) {
                 pg_dir = pgd_offset_k(address);
                 if (pgd_none(*pg_dir)) {
+                        pu_dir = vmem_pud_alloc();
+                        if (!pu_dir)
+                                goto out;
+                        pgd_populate_kernel(&init_mm, pg_dir, pu_dir);
+                }
+
+                pu_dir = pud_offset(pg_dir, address);
+                if (pud_none(*pu_dir)) {
                         pm_dir = vmem_pmd_alloc();
                         if (!pm_dir)
                                 goto out;
-                        pgd_populate_kernel(&init_mm, pg_dir, pm_dir);
+                        pud_populate_kernel(&init_mm, pu_dir, pm_dir);
                 }
 
-                pm_dir = pmd_offset(pg_dir, address);
+                pm_dir = pmd_offset(pu_dir, address);
                 if (pmd_none(*pm_dir)) {
                         pt_dir = vmem_pte_alloc();
                         if (!pt_dir)
@@ -143,6 +154,7 @@ static void vmem_remove_range(unsigned long start, unsigned long size)
 {
         unsigned long address;
         pgd_t *pg_dir;
+        pud_t *pu_dir;
         pmd_t *pm_dir;
         pte_t *pt_dir;
         pte_t  pte;
@@ -150,9 +162,10 @@ static void vmem_remove_range(unsigned long start, unsigned long size)
         pte_val(pte) = _PAGE_TYPE_EMPTY;
         for (address = start; address < start + size; address += PAGE_SIZE) {
                 pg_dir = pgd_offset_k(address);
-                if (pgd_none(*pg_dir))
+                pu_dir = pud_offset(pg_dir, address);
+                if (pud_none(*pu_dir))
                         continue;
-                pm_dir = pmd_offset(pg_dir, address);
+                pm_dir = pmd_offset(pu_dir, address);
                 if (pmd_none(*pm_dir))
                         continue;
                 pt_dir = pte_offset_kernel(pm_dir, address);
@@ -169,6 +182,7 @@ static int vmem_add_mem_map(unsigned long start, unsigned long size)
         unsigned long address, start_addr, end_addr;
         struct page *map_start, *map_end;
         pgd_t *pg_dir;
+        pud_t *pu_dir;
         pmd_t *pm_dir;
         pte_t *pt_dir;
         pte_t  pte;
@@ -183,13 +197,21 @@ static int vmem_add_mem_map(unsigned long start, unsigned long size)
         for (address = start_addr; address < end_addr; address += PAGE_SIZE) {
                 pg_dir = pgd_offset_k(address);
                 if (pgd_none(*pg_dir)) {
+                        pu_dir = vmem_pud_alloc();
+                        if (!pu_dir)
+                                goto out;
+                        pgd_populate_kernel(&init_mm, pg_dir, pu_dir);
+                }
+
+                pu_dir = pud_offset(pg_dir, address);
+                if (pud_none(*pu_dir)) {
                         pm_dir = vmem_pmd_alloc();
                         if (!pm_dir)
                                 goto out;
-                        pgd_populate_kernel(&init_mm, pg_dir, pm_dir);
+                        pud_populate_kernel(&init_mm, pu_dir, pm_dir);
                 }
 
-                pm_dir = pmd_offset(pg_dir, address);
+                pm_dir = pmd_offset(pu_dir, address);
                 if (pmd_none(*pm_dir)) {
                         pt_dir = vmem_pte_alloc();
                         if (!pt_dir)