Re: running get_user_pages() from kernel thread

Andrea Arcangeli
2009-06-16T18:13:36Z

On Tue, Jun 16, 2009 at 09:05:27PM +0300, Izik Eidus wrote:
> So the question is: is this thing is by desgin? (that kernel thread cant
> call get_user_pages???), should i use something like switch_mm()??

I think switch_mm trick should be used for page faults, but gup
shouldn't require it because it gets the 'mm' as parameter and the
current->mm has to be irrelevant. current->mm is only relevant for
gup-fast (obviously :). So I think the only bit that needs fixing is
grab_swap_token to not run if current->mm is null.