Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit ad3256e3 authored by Paul Mundt's avatar Paul Mundt
Browse files

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: default avatarConrad Parker <conrad@metadecks.org>
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent 8be5f1a6

arch/sh/mm/Kconfig

+23 −0
Original line number Diff line number Diff line
@@ -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"