s390/mm: implement dirty bits for large segment table entries
The large segment table entry format has block of bits for the
ACC/F values for the large page. These bits are valid only if
another bit (AV bit 0x10000) of the segment table entry is set.
The ACC/F bits do not have a meaning if the AV bit is off.
This allows to put the THP splitting bit, the segment young bit
and the new segment dirty bit into the ACC/F bits as long as
the AV bit stays off. The dirty and young information is only
available if the pmd is large.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index f90ad85..19daa53 100644
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -1433,6 +1433,9 @@
{
VM_BUG_ON(address & ~HPAGE_PMD_MASK);
+ entry = pmd_mkyoung(entry);
+ if (dirty)
+ entry = pmd_mkdirty(entry);
if (pmd_same(*pmdp, entry))
return 0;
pmdp_invalidate(vma, address, pmdp);