linux-kernel - Re: [GIT PULL] Please pull powerpc/linux.git powerpc-5.3-4 tag

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Date:   Sat, 10 Aug 2019 15:42:06 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        linuxppc-dev@...ts.ozlabs.org, clang-built-linux@...glegroups.com
Subject: Re: [GIT PULL] Please pull powerpc/linux.git powerpc-5.3-4 tag

On Sat, Aug 10, 2019 at 10:21:01AM -0700, Linus Torvalds wrote:
> On Sat, Aug 10, 2019 at 3:11 AM Michael Ellerman <mpe@...erman.id.au> wrote:
> >
> > Just one fix, a revert of a commit that was meant to be a minor improvement to
> > some inline asm, but ended up having no real benefit with GCC and broke booting
> > 32-bit machines when using Clang.
> 
> Pulled, but whenever there are possible subtle compiler issues I get
> nervous, and wonder if the problem was reported to the clang guys?
> 
> In particular, if the kernel change was technically correct, maybe
> somebody else comes along in a few years and tries the same, and then
> it's another odd "why doesn't this work for person X when it works
> just fine for me"..
> 
>                  Linus

It was.

https://github.com/ClangBuiltLinux/linux/issues/593

https://bugs.llvm.org/show_bug.cgi?id=42762

We're still waiting for input from the PowerPC backend maintainers as
that is most likely where this issue originates from.

Cheers,
Nathan