remove the last set_fs() in common code, and remove it for x86 and powerpc v3

[Al Viro]

On Thu, Sep 03, 2020 at 04:30:03PM +0200, Christoph Hellwig wrote:
> On Thu, Sep 03, 2020 at 03:28:03PM +0100, Al Viro wrote:
> > On Thu, Sep 03, 2020 at 04:22:28PM +0200, Christoph Hellwig wrote:
> > 
> > > Besides x86 and powerpc I plan to eventually convert all other
> > > architectures, although this will be a slow process, starting with the
> > > easier ones once the infrastructure is merged.  The process to convert
> > > architectures is roughtly:
> > > 
> > >  (1) ensure there is no set_fs(KERNEL_DS) left in arch specific code
> > >  (2) implement __get_kernel_nofault and __put_kernel_nofault
> > >  (3) remove the arch specific address limitation functionality
> > 
> > The one to really watch out for is sparc; I have something in that
> > direction, will resurrect as soon as I'm done with eventpoll analysis...
> > 
> > I can live with this series; do you want that in vfs.git#for-next?
> 
> Either that or a separate tree is fine with me.  It would be good to
> eventually have a non-rebased stable tree so that other arch trees
> can work from it, though.

FWIW, vfs.git#for-next is always a merge of independent branches; I don't
put stuff directly into #for-next - too easy to lose that way.

IOW, that would be something like #base.set_fs, included into #for-next
merge set.  And I've no problem with never-rebased branches...

Where in the mainline are the most recent prereqs of this series?