Re: clean way to support >32bit addr on 32bit CPU

[Dave <dave.jiang@gmail.com>]

On Mon, 10 Jan 2005 16:09:57 -0800 (PST), Linus Torvalds
<torvalds@osdl.org> wrote:
> 
> 
> On Mon, 10 Jan 2005, Dave wrote:
> >
> > After all said and done, the struct resource members start and end
> > must support 64bit integer values in order to work. On a 64bit arch
> > that would be fine since unsigned long is 64bit. However on a 32bit
> > arch one must use unsigned long long to get 64bit.
> 
> We really should make "struct resource" use u64's. It's wrong even on x86,
> but we've never seen any real problems in practice, so we've had little
> reason to bother.
> 
> This has definitely come up before, maybe there's even some old patch
> floating around. It should be as easy as just fixing up "start/end" to be
> "u64" (and perhaps move them to the beginning of the struct to make sure
> packing is ok on all architectures), and fixing any fall-out.
> 
>                 Linus
> 

Shall I change the PCI resource stuff also to be u64 or leave that
alone?  Currently I think we assume on 32bit processors all PCI
resources are in the first 4GB region. Just wondering if that should
be left alone....

-- 
-= Dave =-

Software Engineer - Advanced Development Engineering Team 
Storage Component Division - Intel Corp. 
mailto://dave.jiang @ intel
http://sourceforge.net/projects/xscaleiop/
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