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authorPaul Mundt <lethal@linux-sh.org>2009-05-14 04:40:08 -0400
committerPaul Mundt <lethal@linux-sh.org>2009-05-14 04:40:08 -0400
commitad3256e361663923342bff7f292dd289f794aa33 (patch)
tree7e7bf2dbfd6e53a7b45fbf4a2b459d3615c18460 /arch/sh/mm
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>
Diffstat (limited to 'arch/sh/mm')
-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 b900d2cd18f7..2795618e4f07 100644
--- a/arch/sh/mm/Kconfig
+++ b/arch/sh/mm/Kconfig
@@ -21,6 +21,29 @@ config PAGE_OFFSET
21 default "0x20000000" if MMU && SUPERH64 21 default "0x20000000" if MMU && SUPERH64
22 default "0x00000000" 22 default "0x00000000"
23 23
24config FORCE_MAX_ZONEORDER
25 int "Maximum zone order"
26 range 9 64 if PAGE_SIZE_16KB
27 default "9" if PAGE_SIZE_16KB
28 range 7 64 if PAGE_SIZE_64KB
29 default "7" if PAGE_SIZE_64KB
30 range 11 64
31 default "14" if !MMU
32 default "11"
33 help
34 The kernel memory allocator divides physically contiguous memory
35 blocks into "zones", where each zone is a power of two number of
36 pages. This option selects the largest power of two that the kernel
37 keeps in the memory allocator. If you need to allocate very large
38 blocks of physically contiguous memory, then you may need to
39 increase this value.
40
41 This config option is actually maximum order plus one. For example,
42 a value of 11 means that the largest free memory block is 2^10 pages.
43
44 The page size is not necessarily 4KB. Keep this in mind when
45 choosing a value for this option.
46
24config MEMORY_START 47config MEMORY_START
25 hex "Physical memory start address" 48 hex "Physical memory start address"
26 default "0x08000000" 49 default "0x08000000"