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>
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index b23c76b..5202eb4 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -89,6 +89,10 @@
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_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