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s390/mm: allow order 10 allocations

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Get rid of FORCE_MAX_ZONEORDER which limited allocations to order 8 (= 1MB)
and use the default, which allows for order 10 (= 4MB) allocations.

Given that s390 allows less than the default this caused some memory
allocation problems more or less unique to s390 from time to time.

Note: this was originally introduced with commit 684de39bd7 ("[S390]
Fix IPL from NSS.") in order to support Named Saved Segments, which
could start/end at an arbitrary 1 megabyte boundary and also before
support for sparsemem vmemmmap was enabled.

Since NSS support is gone, but sparsemem vmemmap support is available
this limitation can go away.

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2020-07-14 08:22:21 +02:00
parent 3c5f2eb969
commit 771cf196cc
1 changed files with 0 additions and 4 deletions
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arch/s390/Kconfig
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@ -625,10 +625,6 @@ config ARCH_ENABLE_MEMORY_HOTREMOVE
config ARCH_ENABLE_SPLIT_PMD_PTLOCK
def_bool y
config FORCE_MAX_ZONEORDER
int
default "9"
config MAX_PHYSMEM_BITS
int "Maximum size of supported physical memory in bits (42-53)"
range 42 53