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authorChristian Borntraeger <borntraeger@de.ibm.com>2009-12-07 12:52:11 +0100
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2009-12-07 12:51:37 +0100
commit6a985c6194017de2c062916ad1cd00dee0302c40 (patch)
treeea19d62cd639876cc1f63e2963276d4fdf2e95b0 /arch/s390/mm
parenta968cd3ef1d315b8c4c48ea65ab5aac8421c2612 (diff)
[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>
Diffstat (limited to 'arch/s390/mm')
-rw-r--r--arch/s390/mm/vmem.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c
index 5f91a38d759..300ab012b0f 100644
--- 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;