During a compile test I ran into the following build error caused with 
CONFIG_SPARC64_PAGE_SIZE_4MB:

<--  snip  -->

...
  CC      init/main.o
In file included from /home/bunk/linux/kernel-2.6/git/linux-2.6/include/linux/gfp.h:4,
                 from /home/bunk/linux/kernel-2.6/git/linux-2.6/include/linux/slab.h:12,
                 from /home/bunk/linux/kernel-2.6/git/linux-2.6/include/linux/percpu.h:5,
                 from /home/bunk/linux/kernel-2.6/git/linux-2.6/include/linux/rcupdate.h:39,
                 from /home/bunk/linux/kernel-2.6/git/linux-2.6/include/linux/pid.h:4,
                 from /home/bunk/linux/kernel-2.6/git/linux-2.6/include/linux/sched.h:74,
                 from include2/asm/uaccess.h:10,
                 from include2/asm/elf.h:10,
                 from /home/bunk/linux/kernel-2.6/git/linux-2.6/include/linux/elf.h:7,
                 from /home/bunk/linux/kernel-2.6/git/linux-2.6/include/linux/module.h:14,
                 from /home/bunk/linux/kernel-2.6/git/linux-2.6/init/main.c:13:
/home/bunk/linux/kernel-2.6/git/linux-2.6/include/linux/mmzone.h:853:2: 
error: #error Allocator MAX_ORDER exceeds SECTION_SIZE
make[2]: *** [init/main.o] Error 1

<--  snip  -->

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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