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s390: expose number of page table levels

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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>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kirill A. Shutemov 2015-04-14 15:46:00 -07:00 committed by Linus Torvalds
parent 06ef42a16f
commit c81956c9cd
1 changed files with 5 additions and 0 deletions
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5
arch/s390/Kconfig
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@ -155,6 +155,11 @@ config S390
config SCHED_OMIT_FRAME_POINTER
def_bool y
config PGTABLE_LEVELS
int
default 4 if 64BIT
default 2
source "init/Kconfig"
source "kernel/Kconfig.freezer"