[S390] dynamic page tables.

Add support for different number of page table levels dependent
on the highest address used for a process. This will cause a 31 bit
process to use a two level page table instead of the four level page
table that is the default after the pud has been introduced. Likewise
a normal 64 bit process will use three levels instead of four. Only
if a process runs out of the 4 tera bytes which can be addressed with
a three level page table the fourth level is dynamically added. Then
the process can use up to 8 peta byte.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/include/asm-s390/mmu_context.h b/include/asm-s390/mmu_context.h
index b3ea3e199921..b5a34c6f91a9 100644
--- a/include/asm-s390/mmu_context.h
+++ b/include/asm-s390/mmu_context.h
@@ -18,9 +18,11 @@ static inline int init_new_context(struct task_struct *tsk,
 {
         mm->context.asce_bits = _ASCE_TABLE_LENGTH | _ASCE_USER_BITS;
 #ifdef CONFIG_64BIT
-        mm->context.asce_bits |= _ASCE_TYPE_REGION2;
+        mm->context.asce_bits |= _ASCE_TYPE_REGION3;
 #endif
         mm->context.noexec = s390_noexec;
+        mm->context.asce_limit = STACK_TOP_MAX;
+        crst_table_init((unsigned long *) mm->pgd, pgd_entry_type(mm));
         return 0;
 }
 
@@ -47,13 +49,12 @@ static inline void update_mm(struct mm_struct *mm, struct task_struct *tsk)
                 /* Load home space page table origin. */
                 asm volatile(LCTL_OPCODE" 13,13,%0"
                              : : "m" (S390_lowcore.user_asce) );
+        set_fs(current->thread.mm_segment);
 }
 
 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
                              struct task_struct *tsk)
 {
-        if (unlikely(prev == next))
-                return;
         cpu_set(smp_processor_id(), next->cpu_vm_mask);
         update_mm(next, tsk);
 }
@@ -65,7 +66,6 @@ static inline void activate_mm(struct mm_struct *prev,
                                struct mm_struct *next)
 {
         switch_mm(prev, next, current);
-        set_fs(current->thread.mm_segment);
 }
 
 #endif /* __S390_MMU_CONTEXT_H */