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authorPaul Mundt <lethal@linux-sh.org>2009-05-14 17:40:08 +0900
committerPaul Mundt <lethal@linux-sh.org>2009-05-14 17:40:08 +0900
commitad3256e361663923342bff7f292dd289f794aa33 (patch)
tree7e7bf2dbfd6e53a7b45fbf4a2b459d3615c18460
parent8be5f1a68f2c14082939dd54e7037dcee2eb54f8 (diff)
sh: Provide FORCE_MAX_ZONEORDER.
Several platforms want to be able to do large physically contiguous allocations (primarily nommu and video codecs on SH-Mobile), provide a MAX_ORDER override for those cases. Tested-by: Conrad Parker <conrad@metadecks.org> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
-rw-r--r--arch/sh/mm/Kconfig23
1 files changed, 23 insertions, 0 deletions
diff --git a/arch/sh/mm/Kconfig b/arch/sh/mm/Kconfig
index b900d2cd18f..2795618e4f0 100644
--- a/arch/sh/mm/Kconfig
+++ b/arch/sh/mm/Kconfig
@@ -21,6 +21,29 @@ config PAGE_OFFSET
default "0x20000000" if MMU && SUPERH64
default "0x00000000"
+config FORCE_MAX_ZONEORDER
+ int "Maximum zone order"
+ range 9 64 if PAGE_SIZE_16KB
+ default "9" if PAGE_SIZE_16KB
+ range 7 64 if PAGE_SIZE_64KB
+ default "7" if PAGE_SIZE_64KB
+ range 11 64
+ default "14" if !MMU
+ default "11"
+ 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 11 means that the largest free memory block is 2^10 pages.
+
+ The page size is not necessarily 4KB. Keep this in mind when
+ choosing a value for this option.
+
config MEMORY_START
hex "Physical memory start address"
default "0x08000000"