s390: remove 31 bit support

Remove the 31 bit support in order to reduce maintenance cost and
effectively remove dead code. Since a couple of years there is no
distribution left that comes with a 31 bit kernel.

The 31 bit kernel also has been broken since more than a year before
anybody noticed. In addition I added a removal warning to the kernel
shown at ipl for 5 minutes: a960062e5826 ("s390: add 31 bit warning
message") which let everybody know about the plan to remove 31 bit
code. We didn't get any response.

Given that the last 31 bit only machine was introduced in 1999 let's
remove the code.
Anybody with 31 bit user space code can still use the compat mode.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 2 insertions, 22 deletions

diff --git a/arch/s390/mm/dump_pagetables.c b/arch/s390/mm/dump_pagetables.c
index d46cadeda204..8556d6be9b54 100644
--- a/arch/s390/mm/dump_pagetables.c
+++ b/arch/s390/mm/dump_pagetables.c
@@ -18,9 +18,7 @@ enum address_markers_idx {
         KERNEL_END_NR,
         VMEMMAP_NR,
         VMALLOC_NR,
-#ifdef CONFIG_64BIT
         MODULES_NR,
-#endif
 };
 
 static struct addr_marker address_markers[] = {
@@ -29,9 +27,7 @@ static struct addr_marker address_markers[] = {
         [KERNEL_END_NR]   = {(unsigned long)&_end, "Kernel Image End"},
         [VMEMMAP_NR]      = {0, "vmemmap Area"},
         [VMALLOC_NR]      = {0, "vmalloc Area"},
-#ifdef CONFIG_64BIT
         [MODULES_NR]      = {0, "Modules Area"},
-#endif
         { -1, NULL }
 };
 
@@ -127,12 +123,6 @@ static void walk_pte_level(struct seq_file *m, struct pg_state *st,
         }
 }
 
-#ifdef CONFIG_64BIT
-#define _PMD_PROT_MASK _SEGMENT_ENTRY_PROTECT
-#else
-#define _PMD_PROT_MASK 0
-#endif
-
 static void walk_pmd_level(struct seq_file *m, struct pg_state *st,
                            pud_t *pud, unsigned long addr)
 {
@@ -145,7 +135,7 @@ static void walk_pmd_level(struct seq_file *m, struct pg_state *st,
                 pmd = pmd_offset(pud, addr);
                 if (!pmd_none(*pmd)) {
                         if (pmd_large(*pmd)) {
-                                prot = pmd_val(*pmd) & _PMD_PROT_MASK;
+                                prot = pmd_val(*pmd) & _SEGMENT_ENTRY_PROTECT;
                                 note_page(m, st, prot, 3);
                         } else
                                 walk_pte_level(m, st, pmd, addr);
@@ -155,12 +145,6 @@ static void walk_pmd_level(struct seq_file *m, struct pg_state *st,
         }
 }
 
-#ifdef CONFIG_64BIT
-#define _PUD_PROT_MASK _REGION3_ENTRY_RO
-#else
-#define _PUD_PROT_MASK 0
-#endif
-
 static void walk_pud_level(struct seq_file *m, struct pg_state *st,
                            pgd_t *pgd, unsigned long addr)
 {
@@ -173,7 +157,7 @@ static void walk_pud_level(struct seq_file *m, struct pg_state *st,
                 pud = pud_offset(pgd, addr);
                 if (!pud_none(*pud))
                         if (pud_large(*pud)) {
-                                prot = pud_val(*pud) & _PUD_PROT_MASK;
+                                prot = pud_val(*pud) & _REGION3_ENTRY_RO;
                                 note_page(m, st, prot, 2);
                         } else
                                 walk_pmd_level(m, st, pud, addr);
@@ -230,13 +214,9 @@ static int pt_dump_init(void)
          * kernel ASCE. We need this to keep the page table walker functions
          * from accessing non-existent entries.
          */
-#ifdef CONFIG_32BIT
-        max_addr = 1UL << 31;
-#else
         max_addr = (S390_lowcore.kernel_asce & _REGION_ENTRY_TYPE_MASK) >> 2;
         max_addr = 1UL << (max_addr * 11 + 31);
         address_markers[MODULES_NR].start_address = MODULES_VADDR;
-#endif
         address_markers[VMEMMAP_NR].start_address = (unsigned long) vmemmap;
         address_markers[VMALLOC_NR].start_address = VMALLOC_START;
         debugfs_create_file("kernel_page_tables", 0400, NULL, NULL, &ptdump_fops);