Re: copy_from_user/copy_to_user question

[Steven Rostedt]

On Sat, 2005-12-03 at 15:35 -0700, Andi Kleen wrote:
> Steven Rostedt <rostedt@xxxxxxxxxxx> writes:
> > 
> > Nope, the kernel is always locked into memory.  If you take a page fault
> > from the kernel world, you will crash and burn. The kernel is never
> > "swapped out".  So if you are in kernel mode, going into do_page_fault
> > in arch/i386/mm/fault.c there is no path to swap a page in.
> 
> Actually there is - when the page fault was caused by *_user. 

Sorry I wasn't clearer.  I know the copy_user case (and explained it in
detail earlier in this thread). I was talking about what happens in the
memcpy case.  So that should have said "outside of copy_user and
friends, there is no path to swap a page in".

-- Steve


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