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

From: Christophe Leroy
Date: Thu Sep 10 2020 - 04:25:52 EST

Le 10/09/2020 à 10:04, David Laight a écrit :
From: Linus Torvalds
Sent: 09 September 2020 22:34
On Wed, Sep 9, 2020 at 11:42 AM Segher Boessenkool
<segher@xxxxxxxxxxxxxxxxxxx> 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

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 :-)

With gcc at least it should work according to

They even explicitely tell: "The only supported use for this feature is to specify registers for input and output operands when calling Extended asm "