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$var-__PAGE_OFFSET

To: kernelnewbies@nl.linux.org
Subject: $var-__PAGE_OFFSET
From: <w.us@verizon.net>
Date: Sat, 13 Jan 2001 17:38:31 -0500 (EST)
Sender: owner-kernelnewbies@nl.linux.org


Hi,

Does someone know why we subtract addresses by __PAGE_OFFSET 
in arch/i386/kernel/head.s on 2.4?

E.g.:
movl $pg0-__PAGE_OFFSET,%edi
cmp $empty_zero_page-__PAGE_OFFSET,%edi
movl $swapper_pg_dir-__PAGE_OFFSET,%eax
etc.


Thanks
Werner





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