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MIPS: Add a CONFIG_FORCE_MAX_ZONEORDER Kconfig option. 

For huge page support with base page size of 16K or 32K, we have to
increase the MAX_ORDER so that huge pages can be allocated.

[Ralf: I don't think a user should have to configure obscure constants like
this but for the time being this will have to suffice.]

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/1685/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
David Daney 2010-10-11 14:52:45 -07:00 committed by Ralf Baechle
parent 82b89152f0
commit c9bace7ca1
1 changed files with 22 additions and 0 deletions
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arch/mips/Kconfig
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@ -1666,6 +1666,28 @@ config PAGE_SIZE_64KB
endchoice
config FORCE_MAX_ZONEORDER
int "Maximum zone order"
range 13 64 if SYS_SUPPORTS_HUGETLBFS && PAGE_SIZE_32KB
default "13" if SYS_SUPPORTS_HUGETLBFS && PAGE_SIZE_32KB
range 12 64 if SYS_SUPPORTS_HUGETLBFS && PAGE_SIZE_16KB
default "12" if SYS_SUPPORTS_HUGETLBFS && PAGE_SIZE_16KB
range 11 64
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 BOARD_SCACHE
bool