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

[David Laight]

From: Linus Torvalds
> Sent: 09 September 2020 22:34
> On Wed, Sep 9, 2020 at 11:42 AM Segher Boessenkool
> <segher at kernel.crashing.org> wrote:
> >
> > It will not work like this in GCC, no.  The LLVM people know about that.
> > I do not know why they insist on pushing this, being incompatible and
> > everything.
> 
> Umm. Since they'd be the ones supporting this, *gcc* would be the
> incompatible one, not clang.

I had an 'interesting' idea.

Can you use a local asm register variable as an input and output to
an 'asm volatile goto' statement?

Well you can - but is it guaranteed to work :-)

	David

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