s390/mm: remove change bit override support

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

4 files changed, 6 insertions, 13 deletions

diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 5efb2fe186e7..7c4af56f2b73 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -216,7 +216,6 @@ extern unsigned long MODULES_END;
  */
 
 /* Hardware bits in the page table entry */
-#define _PAGE_CO        0x100           /* HW Change-bit override */
 #define _PAGE_PROTECT   0x200           /* HW read-only bit  */
 #define _PAGE_INVALID   0x400           /* HW invalid bit    */
 #define _PAGE_LARGE     0x800           /* Bit to mark a large pte */
@@ -233,8 +232,8 @@ extern unsigned long MODULES_END;
 #define __HAVE_ARCH_PTE_SPECIAL
 
 /* Set of bits not changed in pte_modify */
-#define _PAGE_CHG_MASK          (PAGE_MASK | _PAGE_SPECIAL | _PAGE_CO | \
-                                 _PAGE_DIRTY | _PAGE_YOUNG)
+#define _PAGE_CHG_MASK          (PAGE_MASK | _PAGE_SPECIAL | _PAGE_DIRTY | \
+                                 _PAGE_YOUNG)
 
 /*
  * handle_pte_fault uses pte_present, pte_none and pte_file to find out the
@@ -353,7 +352,6 @@ extern unsigned long MODULES_END;
 
 #define _REGION3_ENTRY_LARGE    0x400   /* RTTE-format control, large page  */
 #define _REGION3_ENTRY_RO       0x200   /* page protection bit              */
-#define _REGION3_ENTRY_CO       0x100   /* change-recording override        */
 
 /* Bits in the segment table entry */
 #define _SEGMENT_ENTRY_BITS     0xfffffffffffffe33UL
@@ -370,7 +368,6 @@ extern unsigned long MODULES_END;
 #define _SEGMENT_ENTRY_YOUNG    0x1000  /* SW segment young bit */
 #define _SEGMENT_ENTRY_SPLIT    0x0800  /* THP splitting bit */
 #define _SEGMENT_ENTRY_LARGE    0x0400  /* STE-format control, large page */
-#define _SEGMENT_ENTRY_CO       0x0100  /* change-recording override   */
 #define _SEGMENT_ENTRY_READ     0x0002  /* SW segment read bit */
 #define _SEGMENT_ENTRY_WRITE    0x0001  /* SW segment write bit */
 
@@ -887,8 +884,6 @@ static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
                 pgste = pgste_set_pte(ptep, pgste, entry);
                 pgste_set_unlock(ptep, pgste);
         } else {
-                if (!(pte_val(entry) & _PAGE_INVALID) && MACHINE_HAS_EDAT1)
-                        pte_val(entry) |= _PAGE_CO;
                 *ptep = entry;
         }
 }
diff --git a/arch/s390/mm/dump_pagetables.c b/arch/s390/mm/dump_pagetables.c
index 46d517c3c763..d46cadeda204 100644
--- a/arch/s390/mm/dump_pagetables.c
+++ b/arch/s390/mm/dump_pagetables.c
@@ -54,7 +54,6 @@ static void print_prot(struct seq_file *m, unsigned int pr, int level)
                 return;
         }
         seq_printf(m, "%s", pr & _PAGE_PROTECT ? "RO " : "RW ");
-        seq_printf(m, "%s", pr & _PAGE_CO ? "CO " : "   ");
         seq_putc(m, '\n');
 }
 
@@ -129,7 +128,7 @@ static void walk_pte_level(struct seq_file *m, struct pg_state *st,
 }
 
 #ifdef CONFIG_64BIT
-#define _PMD_PROT_MASK (_SEGMENT_ENTRY_PROTECT | _SEGMENT_ENTRY_CO)
+#define _PMD_PROT_MASK _SEGMENT_ENTRY_PROTECT
 #else
 #define _PMD_PROT_MASK 0
 #endif
@@ -157,7 +156,7 @@ static void walk_pmd_level(struct seq_file *m, struct pg_state *st,
 }
 
 #ifdef CONFIG_64BIT
-#define _PUD_PROT_MASK (_REGION3_ENTRY_RO | _REGION3_ENTRY_CO)
+#define _PUD_PROT_MASK _REGION3_ENTRY_RO
 #else
 #define _PUD_PROT_MASK 0
 #endif
diff --git a/arch/s390/mm/hugetlbpage.c b/arch/s390/mm/hugetlbpage.c
index 389bc17934b7..3c80d2e38f03 100644
--- a/arch/s390/mm/hugetlbpage.c
+++ b/arch/s390/mm/hugetlbpage.c
@@ -88,7 +88,7 @@ void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
                 pmd_val(pmd) &= ~_SEGMENT_ENTRY_ORIGIN;
                 pmd_val(pmd) |= pte_page(pte)[1].index;
         } else
-                pmd_val(pmd) |= _SEGMENT_ENTRY_LARGE | _SEGMENT_ENTRY_CO;
+                pmd_val(pmd) |= _SEGMENT_ENTRY_LARGE;
         *(pmd_t *) ptep = pmd;
 }
 
diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c
index 121aff0a66b7..88475b894a86 100644
--- a/arch/s390/mm/vmem.c
+++ b/arch/s390/mm/vmem.c
@@ -236,8 +236,7 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)
                                 if (!new_page)
                                         goto out;
                                 pmd_val(*pm_dir) = __pa(new_page) |
-                                        _SEGMENT_ENTRY | _SEGMENT_ENTRY_LARGE |
-                                        _SEGMENT_ENTRY_CO;
+                                        _SEGMENT_ENTRY | _SEGMENT_ENTRY_LARGE;
                                 address = (address + PMD_SIZE) & PMD_MASK;
                                 continue;
                         }