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

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Date:   Wed, 9 Sep 2020 13:40:01 -0500
From:   Segher Boessenkool <segher@...nel.crashing.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Al Viro <viro@...iv.linux.org.uk>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-arch <linux-arch@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Christoph Hellwig <hch@....de>
Subject: Re: remove the last set_fs() in common code, and remove it for x86 and powerpc v3

On Wed, Sep 09, 2020 at 10:31:34AM -0700, Linus Torvalds wrote:
> And apparently there are people working on this on the gcc side too,
> so it won't just be clang-specific. Nor kernel-specific in that Nick
> tells me some other projects are looking at using that asm goto with
> outputs too.

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.


Segher