1 files changed, 43 insertions, 0 deletions

diff --git a/arch/s390/mm/pageattr.c b/arch/s390/mm/pageattr.c
index 73c3da393e88..29ccee3651f4 100644
--- a/arch/s390/mm/pageattr.c
+++ b/arch/s390/mm/pageattr.c
@@ -105,3 +105,46 @@ int set_memory_x(unsigned long addr, int numpages)
 {
         return 0;
 }
+
+#ifdef CONFIG_DEBUG_PAGEALLOC
+void kernel_map_pages(struct page *page, int numpages, int enable)
+{
+        unsigned long address;
+        pgd_t *pgd;
+        pud_t *pud;
+        pmd_t *pmd;
+        pte_t *pte;
+        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_ipte(address, pte);
+                        pte_val(*pte) = _PAGE_TYPE_EMPTY;
+                        continue;
+                }
+                *pte = mk_pte_phys(address, __pgprot(_PAGE_TYPE_RW));
+        }
+}
+
+#ifdef CONFIG_HIBERNATION
+bool kernel_page_present(struct page *page)
+{
+        unsigned long addr;
+        int cc;
+
+        addr = page_to_phys(page);
+        asm volatile(
+                "       lra     %1,0(%1)\n"
+                "       ipm     %0\n"
+                "       srl     %0,28"
+                : "=d" (cc), "+a" (addr) : : "cc");
+        return cc == 0;
+}
+#endif /* CONFIG_HIBERNATION */
+
+#endif /* CONFIG_DEBUG_PAGEALLOC */