[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, 1 deletions

diff --git a/include/asm-s390/elf.h b/include/asm-s390/elf.h
index b760cd4de385..b3ac262c4582 100644
--- a/include/asm-s390/elf.h
+++ b/include/asm-s390/elf.h
@@ -138,7 +138,7 @@ typedef s390_regs elf_gregset_t;
    use of this is to invoke "./ld.so someprog" to test out a new version of
    the loader.  We need to make sure that it is out of the way of the program
    that it will "exec", and that there is sufficient room for the brk.  */
-#define ELF_ET_DYN_BASE         (TASK_SIZE / 3 * 2)
+#define ELF_ET_DYN_BASE         (STACK_TOP / 3 * 2)
 
 /* Wow, the "main" arch needs arch dependent functions too.. :) */