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sparc64: Add FORCE_MAX_ZONEORDER and default to 13 

This change allows ATU (new IOMMU) in SPARC systems to request
large (32M) contiguous memory during boot for creating IOTSB backing
store.

Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Signed-off-by: Tushar Dave <tushar.n.dave@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dave Kleikamp 2016-10-28 10:12:40 -07:00 committed by David S. Miller
parent 87a349f9cc
commit c88c545bf3
1 changed files with 18 additions and 0 deletions
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18
arch/sparc/Kconfig
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@ -89,6 +89,10 @@ config ARCH_DEFCONFIG
config ARCH_PROC_KCORE_TEXT
def_bool y
config ARCH_ATU
bool
default y if SPARC64
config IOMMU_HELPER
bool
default y if SPARC64
@ -304,6 +308,20 @@ config ARCH_SPARSEMEM_ENABLE
config ARCH_SPARSEMEM_DEFAULT
def_bool y if SPARC64
config FORCE_MAX_ZONEORDER
int "Maximum zone order"
default "13"
help
The kernel memory allocator divides physically contiguous memory
blocks into "zones", where each zone is a power of two number of
pages. This option selects the largest power of two that the kernel
keeps in the memory allocator. If you need to allocate very large
blocks of physically contiguous memory, then you may need to
increase this value.
This config option is actually maximum order plus one. For example,
a value of 13 means that the largest free memory block is 2^12 pages.
source "mm/Kconfig"
if SPARC64