end of the actual instruction sequence for the function but before some
misc data in the text segment. This eliminates a strange "size must be
constant" error from the integrated assembler. Also, the build_pagetables
function was missing an END(), but really the problem is that it shouldn't
have an ASENTRY() because it's not a function that needs to be a global
symbol with unwind info and all, it's just a little private subroutine
used in very early kernel init.
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