RE: Why can't we use the user-space pointer in kernel mode?

["Bennett, Robert P" <Robert.Bennett@xxxxxx>]

> -----Original Message-----
> From: kernelnewbies-bounce@xxxxxxxxxxxx 
> [mailto:kernelnewbies-bounce@xxxxxxxxxxxx] On Behalf Of cheng long
> Sent: Wednesday, May 03, 2006 10:20 AM
> To: arjan@xxxxxxxxxxxxx
> Cc: kernelnewbies@xxxxxxxxxxxx
> Subject: Re: Why can't we use the user-space pointer in kernel mode?
> 
> 
> > because it may be swapped out to disk ...
> > you need a special function that can deal with that (and swaps it 
> > right back in)
> Why can't we use the "page fault handler" like in user space 
> to swap the page back in?

     Why can't you just use copy_*_user() functions and let them take
care of these details, or am I missing something?

> 
> Thanks,
> Cheng
> 
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