- Update to 2.6.25-rc3.

[linux-flexiantxendom0-3.2.10.git] / arch / s390 / mm / init.c

diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index b234bb4..8053245 100644 (file)
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -112,6 +112,7 @@ void __init paging_init(void)
        init_mm.pgd = swapper_pg_dir;
        S390_lowcore.kernel_asce = __pa(init_mm.pgd) & PAGE_MASK;
 #ifdef CONFIG_64BIT
+       /* A three level page table (4TB) is enough for the kernel space. */
        S390_lowcore.kernel_asce |= _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH;
        pgd_type = _REGION3_ENTRY_EMPTY;
 #else
@@ -167,6 +168,33 @@ void __init mem_init(void)
               PFN_ALIGN((unsigned long)&_eshared) - 1);
 }
 
+#ifdef CONFIG_DEBUG_PAGEALLOC
+void kernel_map_pages(struct page *page, int numpages, int enable)
+{
+       pgd_t *pgd;
+       pud_t *pud;
+       pmd_t *pmd;
+       pte_t *pte;
+       unsigned long address;
+       int i;
+
+       for (i = 0; i < numpages; i++) {
+               address = page_to_phys(page + i);
+               pgd = pgd_offset_k(address);
+               pud = pud_offset(pgd, address);
+               pmd = pmd_offset(pud, address);
+               pte = pte_offset_kernel(pmd, address);
+               if (!enable) {
+                       ptep_invalidate(&init_mm, address, pte);
+                       continue;
+               }
+               *pte = mk_pte_phys(address, __pgprot(_PAGE_TYPE_RW));
+               /* Flush cpu write queue. */
+               mb();
+       }
+}
+#endif
+
 void free_initmem(void)
 {
         unsigned long addr;