From ad3256e361663923342bff7f292dd289f794aa33 Mon Sep 17 00:00:00 2001 From: Paul Mundt Date: Thu, 14 May 2009 17:40:08 +0900 Subject: [PATCH] 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 Signed-off-by: Paul Mundt --- arch/sh/mm/Kconfig | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) 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 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" -- 2.39.2