diff options
Diffstat (limited to 'arch/s390/mm/init.c')
| -rw-r--r-- | arch/s390/mm/init.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c index 59b663109d9..5d633019d8f 100644 --- a/arch/s390/mm/init.c +++ b/arch/s390/mm/init.c @@ -26,6 +26,7 @@ #include <linux/pfn.h> #include <linux/poison.h> #include <linux/initrd.h> +#include <linux/export.h> #include <linux/gfp.h> #include <asm/processor.h> #include <asm/system.h> @@ -92,18 +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(); |