Re: page->offset & PAGE_MASK
Linus Torvalds (torvalds@transmeta.com)
Mon, 2 Feb 1998 14:50:34 -0800 (PST)
On Sun, 1 Feb 1998 chip@atlantic.net wrote:
>
> I'm working on extending Linux's VM mechanism beyond 2G.
>
> A comment in include/linux/mm.h says that page->offset need not be
> a multiple of PAGE_SIZE. However, the code in mm/*.c _seems_ always
> to set it so.
Look at the exec() functions, especially for a.out. I think it's OMAGIC
that is not guaranteed to be page-aligned (in fact, it is guaranteed to
_not_ be page-aligned: the executable will start at offset 1024 in the
file).
Linus