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powerpc: Enforce sane MAX_ORDER

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powerpc uses CONFIG_FORCE_MAX_ZONEORDER, and some things depend on it
being at least 10 when 64k pages are not configured (notably the dart
iommu code with CONFIG_PM). The defaults are fine, but when going from a
64K pages config to one without 64K pages, MAX_ORDER stays at 9 which is
too low for 4K pages.

This patch makes the Kconfig enforce at least the defaults.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Johannes Berg 2008-09-24 04:29:08 +00:00 committed by Benjamin Herrenschmidt
parent 2e2b4043cc
commit ebe40c5c4c
1 changed files with 3 additions and 0 deletions
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3
arch/powerpc/Kconfig
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@ -415,8 +415,11 @@ config PPC_64K_PAGES
config FORCE_MAX_ZONEORDER
int "Maximum zone order"
range 9 64 if PPC_64K_PAGES
default "9" if PPC_64K_PAGES
range 13 64 if PPC64 && !PPC_64K_PAGES
default "13" if PPC64 && !PPC_64K_PAGES
range 11 64
default "11"
help
The kernel memory allocator divides physically contiguous memory