From: kernelnewbies-bounce@xxxxxxxxxxxx [mailto:kernelnewbies-bounce@xxxxxxxxxxxx] On Behalf Of cheng long >But in copy_from_user() function, the kernel do copy the data intto kernel space besides making some necessory checks. >In fact, the do_page_fault() function will generate "Oops" when accessing a swapped out user space page. why is that? why >don't the >do_page_fault() swapped it back in? It is a long time since I have gone through the Page Fault handler code, but I seem to remember that at least in 2.4 kernels, the Page Fault handler code will not call Oops if the address that caused the fault do belong to the process address space of whose context the kernel thread is executing. Or am I wrong here ? -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/ -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
