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, I used 999
as the upper bound for no particular reason other than that it's plenty.
Signed-off-by: Johannes Berg <[EMAIL PROTECTED]>
---
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -415,8 +415,11 @@ config PPC_64K_PAGES
config FORCE_MAX_ZONEORDER
int "Maximum zone order"
+ range 9 999 if PPC_64K_PAGES
default "9" if PPC_64K_PAGES
+ range 13 999 if PPC64 && !PPC_64K_PAGES
default "13" if PPC64 && !PPC_64K_PAGES
+ range 11 999
default "11"
help
The kernel memory allocator divides physically contiguous memory
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