[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, 1 insertions, 0 deletions

diff --git a/include/asm-s390/mmu.h b/include/asm-s390/mmu.h
index 13ec4215f437..1698e29c5b20 100644
--- a/include/asm-s390/mmu.h
+++ b/include/asm-s390/mmu.h
@@ -5,6 +5,7 @@ typedef struct {
         struct list_head crst_list;
         struct list_head pgtable_list;
         unsigned long asce_bits;
+        unsigned long asce_limit;
         int noexec;
 } mm_context_t;