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Subject[PATCH 12/19] s390: expose number of page table levels
Date
We would want to use number of page table level to define mm_struct.
Let's expose it as CONFIG_PGTABLE_LEVELS.

Core mm expects __PAGETABLE_{PUD,PMD}_FOLDED to be defined if these page
table levels folded.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
---
arch/s390/Kconfig | 5 +++++
arch/s390/include/asm/pgtable.h | 2 ++
2 files changed, 7 insertions(+)

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 8d11babf9aa5..ddf9ebd4c254 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -155,6 +155,11 @@ config S390
config SCHED_OMIT_FRAME_POINTER
def_bool y

+config PGTABLE_LEVELS
+ int
+ default 4 if 64BI
+ default 2
+
source "init/Kconfig"

source "kernel/Kconfig.freezer"
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index fbb5ee3ae57c..e08ec38f8c6e 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -91,7 +91,9 @@ extern unsigned long zero_page_mask;
*/
#define PTRS_PER_PTE 256
#ifndef CONFIG_64BIT
+#define __PAGETABLE_PUD_FOLDED
#define PTRS_PER_PMD 1
+#define __PAGETABLE_PMD_FOLDED
#define PTRS_PER_PUD 1
#else /* CONFIG_64BIT */
#define PTRS_PER_PMD 2048
--
2.1.4


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