tree 781f98037ec772f2b7d480d5642135f7c1ec8b89
parent 2887fc5aa60803b9d6d38c79248805f08d8b0e28
author Martin Schwidefsky <schwidefsky@de.ibm.com> 1237379256 +0100
committer Martin Schwidefsky <schwidefsky@de.ibm.com> 1237379293 +0100

[S390] make page table walking more robust

Make page table walking on s390 more robust. The current code requires
that the pgd/pud/pmd/pte loop is only done for address ranges that are
below the end address of the last vma of the address space. But this
is not always true, e.g. the generic page table walker does not guarantee
this. Change TASK_SIZE/TASK_SIZE_OF to reflect the current size of the
address space. This makes the generic page table walker happy but it
breaks the upgrade of a 3 level page table to a 4 level page table.
To make the upgrade work again another fix is required.

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