s390/mm: move kernel_page_present/kernel_map_pages to page_attr.c

[deliverable/linux.git] / arch / s390 / mm / pageattr.c

diff --git a/arch/s390/mm/pageattr.c b/arch/s390/mm/pageattr.c
index 73c3da393e88dfd332fbb8314397ae69d6c623cc..29ccee3651f410b670f71e51deb4a6757e148b19 100644 (file)
--- 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 */