Hi Dave, s390x: Allow HW Change-bit override for page table entries The HW Change-bit override (0x100) is used now for s390x. This patch allows page table entries that have set this bit. Signed-off-by: Michael Holzheu <holzheu(a)linux.vnet.ibm.com&gt; --- s390x.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) --- a/s390x.c +++ b/s390x.c @@ -600,11 +600,10 @@ static ulong _kl_pg_table_deref_s390x(ul readmem(table + offset, KVADDR, &entry, sizeof(entry), "entry", FAULT_ON_ERROR); /* - * Return zero if the page table entry has any of the reserved bits - * set (0x900) or the invalid bit (0x400) is set and it is not a - * swap entry. + * Return zero if the page table entry has the reserved (0x800) or + * the invalid (0x400) bit set and it is not a swap entry. */ - if ((entry & 0xd00ULL) && !swap_entry(entry)) + if ((entry & 0xc00ULL) && !swap_entry(entry)) return 0; /* Page table entry is valid and well formed. */ return entry;