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Diffstat (limited to 'arch/s390/mm/init.c')
-rw-r--r--arch/s390/mm/init.c16
1 files changed, 10 insertions, 6 deletions
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index d4b9fb4d004..5d633019d8f 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -93,18 +93,22 @@ static unsigned long setup_zero_pages(void)
void __init paging_init(void)
{
unsigned long max_zone_pfns[MAX_NR_ZONES];
- unsigned long pgd_type;
+ unsigned long pgd_type, asce_bits;
init_mm.pgd = swapper_pg_dir;
- S390_lowcore.kernel_asce = __pa(init_mm.pgd) & PAGE_MASK;
#ifdef CONFIG_64BIT
- /* A three level page table (4TB) is enough for the kernel space. */
- S390_lowcore.kernel_asce |= _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH;
- pgd_type = _REGION3_ENTRY_EMPTY;
+ if (VMALLOC_END > (1UL << 42)) {
+ asce_bits = _ASCE_TYPE_REGION2 | _ASCE_TABLE_LENGTH;
+ pgd_type = _REGION2_ENTRY_EMPTY;
+ } else {
+ asce_bits = _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH;
+ pgd_type = _REGION3_ENTRY_EMPTY;
+ }
#else
- S390_lowcore.kernel_asce |= _ASCE_TABLE_LENGTH;
+ asce_bits = _ASCE_TABLE_LENGTH;
pgd_type = _SEGMENT_ENTRY_EMPTY;
#endif
+ S390_lowcore.kernel_asce = (__pa(init_mm.pgd) & PAGE_MASK) | asce_bits;
clear_table((unsigned long *) init_mm.pgd, pgd_type,
sizeof(unsigned long)*2048);
vmem_map_init();