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Commit 6ccf61f9 authored by Timur Tabi's avatar Timur Tabi Committed by Paul Mackerras
Browse files

[POWERPC] Enable CONFIG_FORCE_MAX_ZONEORDER for all PowerPC, and make selectable 



This enables the FORCE_MAX_ZONEORDER Kconfig option for all PowerPC
systems.  Previously, it was enabled only for 64-bit systems.  We also
make the option selectable from the menu, so that the user can specify
different values.  This is useful for 32-bit systems that need to
allocate more than 4MB of physically contiguous memory.

Signed-off-by: default avatarTimur Tabi <timur@freescale.com>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent c5d5d94a

arch/powerpc/Kconfig

+17 −6
Original line number Original line Diff line number Diff line
@@ -211,14 +211,25 @@ source kernel/Kconfig.hz 
source kernel/Kconfig.preempt

source kernel/Kconfig.preempt

source "fs/Kconfig.binfmt"

source "fs/Kconfig.binfmt"





# We optimistically allocate largepages from the VM, so make the limit

# large enough (16MB). This badly named config option is actually

# max order + 1

config FORCE_MAX_ZONEORDER

config FORCE_MAX_ZONEORDER

	int

	int "Maximum zone order"

	depends on PPC64

	default "9" if PPC_64K_PAGES

	default "9" if PPC_64K_PAGES

	default "13"

	default "13" if PPC64

	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.  For example, on 64-bit

	  systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES.  Keep

	  this in mind when choosing a value for this option.





config HUGETLB_PAGE_SIZE_VARIABLE

config HUGETLB_PAGE_SIZE_VARIABLE

	bool

	bool