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s390: make MAX_PHYSMEM_BITS configurable 

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2017-03-27 15:36:20 +02:00 committed by Martin Schwidefsky
parent fd15a1f333
commit b8402b957d
2 changed files with 11 additions and 1 deletions
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10
arch/s390/Kconfig
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@ -537,6 +537,16 @@ config FORCE_MAX_ZONEORDER
source "mm/Kconfig"
config MAX_PHYSMEM_BITS
int "Maximum size of supported physical memory in bits (42-53)"
range 42 53
default "46"
help
This option specifies the maximum supported size of physical memory
in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB).
Increasing the number of bits also increases the kernel image size.
By default 46 bits (64TB) are supported.
config PACK_STACK
def_bool y
prompt "Pack kernel stack"

2
arch/s390/include/asm/sparsemem.h
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@ -2,6 +2,6 @@
#define _ASM_S390_SPARSEMEM_H
#define SECTION_SIZE_BITS 28
#define MAX_PHYSMEM_BITS 46
#define MAX_PHYSMEM_BITS CONFIG_MAX_PHYSMEM_BITS
#endif /* _ASM_S390_SPARSEMEM_H */