[POWERPC] Fix MAX_ORDER config problem

The allyesconfig (among others) build was giving this:

In file included from include/linux/gfp.h:4,
from include/linux/slab.h:14,
from include/linux/percpu.h:5,
from include2/asm/time.h:18,
from include2/asm/cputime.h:26,
from include/linux/sched.h:67,
from
arch/powerpc/kernel/asm-offsets.c:17:
include/linux/mmzone.h:791:2: error: #error Allocator MAX_ORDER exceeds SECTION_SIZE

Kconfig options are order depenendent, so move the setting of
FORCE_MAX_ZONEORDER to after the setting of PPC_64K_PAGES. Also add an
explicit !PPC_64K_PAGES.

Signed-off-by: Stephen Rothwell <[e-mail]>
Signed-off-by: Paul Mackerras <[e-mail]>

arch/powerpc/Kconfig

···
 source kernel/Kconfig.preempt
 source "fs/Kconfig.binfmt"
 
-config FORCE_MAX_ZONEORDER
-	int "Maximum zone order"
-	default "9" if PPC_64K_PAGES
-	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
 	bool
 	depends on HUGETLB_PAGE
···
 	  them by loading each individual 4k page on demand transparently,
 	  while on hardware with such support, it will be used to map
 	  normal application pages.
+
+config FORCE_MAX_ZONEORDER
+	int "Maximum zone order"
+	default "9" if PPC_64K_PAGES
+	default "13" if PPC64 && !PPC_64K_PAGES
+	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 PPC_SUBPAGE_PROT
 	bool "Support setting protections for 4k subpages"