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powerpc: Enforce sane MAX_ORDER
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>
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@ -415,8 +415,11 @@ config PPC_64K_PAGES
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config FORCE_MAX_ZONEORDER
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int "Maximum zone order"
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range 9 64 if PPC_64K_PAGES
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default "9" if PPC_64K_PAGES
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range 13 64 if PPC64 && !PPC_64K_PAGES
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default "13" if PPC64 && !PPC_64K_PAGES
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range 11 64
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default "11"
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help
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The kernel memory allocator divides physically contiguous memory
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