Absolute symbols in vmlinux_64.lds.S

[Jeremy Fitzhardinge]

Why does vmlinux_64.lds.S use absolute symbols for things like 
__bss_start/stop:

 __bss_start = .;		/* BSS */
 .bss : AT(ADDR(.bss) - LOAD_OFFSET) {
	*(.bss.page_aligned)
	*(.bss)
	}
 __bss_stop = .;


vmlinux_32.lds.S puts __bss_start/stop into the .bss section itself.  Is 
there some particular reason they need to be absolute symbols (relocation?).

Thanks,
   J
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