[S390] s390: use change recording override for kernel mapping

We dont need the dirty bit if a write access is done via the kernel
mapping. In that case SetPageDirty and friends are used anyway, no
need to do that a second time. We can use the change-recording
overide function for the kernel mapping, if available.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 60a7b1a..e2fa79c 100644 (file)
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -169,12 +169,13 @@ extern unsigned long VMALLOC_START;
  * STL Segment-Table-Length:  Segment-table length (STL+1*16 entries -> up to 2048)
  *
  * A 64 bit pagetable entry of S390 has following format:
- * |                     PFRA                         |0IP0|  OS  |
+ * |                    PFRA                         |0IPC|  OS  |
  * 0000000000111111111122222222223333333333444444444455555555556666
  * 0123456789012345678901234567890123456789012345678901234567890123
  *
  * I Page-Invalid Bit:    Page is not available for address-translation
  * P Page-Protection Bit: Store access not possible for page
+ * C Change-bit override: HW is not required to set change bit
  *
  * A 64 bit segmenttable entry of S390 has following format:
  * |        P-table origin                              |      TT
@@ -218,6 +219,7 @@ extern unsigned long VMALLOC_START;
  */
 
 /* Hardware bits in the page table entry */
+#define _PAGE_CO       0x100           /* HW Change-bit override */
 #define _PAGE_RO       0x200           /* HW read-only bit  */
 #define _PAGE_INVALID  0x400           /* HW invalid bit    */
 

diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c
index 5f91a38..300ab01 100644 (file)
--- a/arch/s390/mm/vmem.c
+++ b/arch/s390/mm/vmem.c
@@ -70,8 +70,12 @@ static pte_t __ref *vmem_pte_alloc(void)
                pte = alloc_bootmem(PTRS_PER_PTE * sizeof(pte_t));
        if (!pte)
                return NULL;
-       clear_table((unsigned long *) pte, _PAGE_TYPE_EMPTY,
-                   PTRS_PER_PTE * sizeof(pte_t));
+       if (MACHINE_HAS_HPAGE)
+               clear_table((unsigned long *) pte, _PAGE_TYPE_EMPTY | _PAGE_CO,
+                           PTRS_PER_PTE * sizeof(pte_t));
+       else
+               clear_table((unsigned long *) pte, _PAGE_TYPE_EMPTY,
+                           PTRS_PER_PTE * sizeof(pte_t));
        return pte;
 }
 
@@ -112,7 +116,8 @@ static int vmem_add_mem(unsigned long start, unsigned long size, int ro)
                if (MACHINE_HAS_HPAGE && !(address & ~HPAGE_MASK) &&
                    (address + HPAGE_SIZE <= start + size) &&
                    (address >= HPAGE_SIZE)) {
-                       pte_val(pte) |= _SEGMENT_ENTRY_LARGE;
+                       pte_val(pte) |= _SEGMENT_ENTRY_LARGE |
+                                       _SEGMENT_ENTRY_CO;
                        pmd_val(*pm_dir) = pte_val(pte);
                        address += HPAGE_SIZE - PAGE_SIZE;
                        continue;