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sh: Provide FORCE_MAX_ZONEORDER.

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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>
This commit is contained in:
Paul Mundt 2009-05-14 17:40:08 +09:00
parent 8be5f1a68f
commit ad3256e361
1 changed files with 23 additions and 0 deletions
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arch/sh/mm/Kconfig
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@ -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"