On Wed, 2006-05-03 at 18:56 +0800, cheng long wrote: > Hi, all > > Since the progress in kernel mode can access the whole address space, > why we must copy the user-space data into kernel space? > Why can't we dereference the user-space pointer directly? because it may be swapped out to disk ... you need a special function that can deal with that (and swaps it right back in) -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
