[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Copy_to_user/copy_from_user

Erik Mouw wrote:
> 
> On Tue, Dec 04, 2001 at 10:11:56PM -0800, Amit Purohit wrote:
> > As the kernel address space in the new linux kernels
> > spans the entire 0 to 4 GB, still why do we need to do
> > copy_to_user or copy_from user ?
> 
> Because we can't be sure that the page is in physical memory.

If it's not, we'll just have to service a page fault; why's
that a problem?

Cheers,

-- Joe
--
Kernelnewbies: Help each other learn about the Linux kernel.
Archive:       http://mail.nl.linux.org/kernelnewbies/
IRC Channel:   irc.openprojects.net / #kernelnewbies
Web Page:      http://www.kernelnewbies.org/