s390/mm,vmem: use 2GB frames for identity mapping
Use 2GB frames for indentity mapping if EDAT2 is
available to reduce TLB pressure.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/mm/dump_pagetables.c b/arch/s390/mm/dump_pagetables.c
index cbc6668..04e4892 100644
--- a/arch/s390/mm/dump_pagetables.c
+++ b/arch/s390/mm/dump_pagetables.c
@@ -150,6 +150,7 @@
static void walk_pud_level(struct seq_file *m, struct pg_state *st,
pgd_t *pgd, unsigned long addr)
{
+ unsigned int prot;
pud_t *pud;
int i;
@@ -157,7 +158,11 @@
st->current_address = addr;
pud = pud_offset(pgd, addr);
if (!pud_none(*pud))
- walk_pmd_level(m, st, pud, addr);
+ if (pud_large(*pud)) {
+ prot = pud_val(*pud) & _PAGE_RO;
+ note_page(m, st, prot, 2);
+ } else
+ walk_pmd_level(m, st, pud, addr);
else
note_page(m, st, _PAGE_INVALID, 2);
addr += PUD_SIZE;