[PATCH 0/6] RCU get_user_pages_fast and __get_user_pages_fast

[Peter Zijlstra]

On Wed, Jun 25, 2014 at 01:42:35PM -0700, Andrew Morton wrote:
> On Wed, 25 Jun 2014 16:40:18 +0100 Steve Capper <steve.capper at linaro.org> wrote:
> 
> > This series implements general forms of get_user_pages_fast and
> > __get_user_pages_fast and activates them for arm and arm64.
> 
> Why not x86?
> 
> I think I might have already asked this.  If so, it's your fault for
> not updating the changelog ;)

Because x86 doesn't do RCU freed page tables :-) Also because i386 PAE
has magic (although one might expect ARM PAE -- or whatever they called
it -- to need similar magic).