On Mon, 29 Jan 2007 15:46:20 +0000 (GMT), "Maciej W. Rozycki"
> Well, the option used to select between 64-bit and 32-bit ELF for
> building 64-bit configurations. I can see it has been changed from its
> original meaning and it now only controls whether "-mno-explicit-relocs"
> is passed to the compiler or not, which is sort of useless and certainly
> does not match the intent nor what the description says. The 64-bit
> format is now used unconditionally and you can always pass such obscure
> options to the compiler on the make's command line, so instead of this fix
> I vote for complete removal of the BUILD_ELF64 option.
Though I do not know much about -mno-explicit-relocs,
CONFIG_BUILD_ELF64 controls -msym32 option and this is the reason of
the tweak in __pa_page_offset().
I thought -msym32 can not be used for 64-bit kernels which do not have
CKSEG load address, but apparently IP27 is using -msym32 with XKPHYS
load address. Hmm...