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-rw-r--r--include/asm-s390/pgtable.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/include/asm-s390/pgtable.h b/include/asm-s390/pgtable.h
index 76e8a7904e8..f8347ce9c5a 100644
--- a/include/asm-s390/pgtable.h
+++ b/include/asm-s390/pgtable.h
@@ -220,6 +220,8 @@ extern char empty_zero_page[PAGE_SIZE];
/* Software bits in the page table entry */
#define _PAGE_SWT 0x001 /* SW pte type bit t */
#define _PAGE_SWX 0x002 /* SW pte type bit x */
+#define _PAGE_SPECIAL 0x004 /* SW associated with special page */
+#define __HAVE_ARCH_PTE_SPECIAL
/* Six different types of pages. */
#define _PAGE_TYPE_EMPTY 0x400
@@ -520,7 +522,7 @@ static inline int pte_file(pte_t pte)
static inline int pte_special(pte_t pte)
{
- return 0;
+ return (pte_val(pte) & _PAGE_SPECIAL);
}
#define __HAVE_ARCH_PTE_SAME
@@ -722,6 +724,7 @@ static inline pte_t pte_mkyoung(pte_t pte)
static inline pte_t pte_mkspecial(pte_t pte)
{
+ pte_val(pte) |= _PAGE_SPECIAL;
return pte;
}