linux-kernel - Re: [PATCH 5.4 044/158] compiler.h: fix barrier

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Date:   Fri, 11 Dec 2020 12:25:07 -0800
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Arvind Sankar <nivedita@...m.mit.edu>,
        Randy Dunlap <rdunlap@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "# 3.4.x" <stable@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Sasha Levin <sashal@...nel.org>,
        Palmer Dabbelt <palmerdabbelt@...gle.com>
Subject: Re: [PATCH 5.4 044/158] compiler.h: fix barrier_data() on clang

On Mon, Nov 23, 2020 at 10:57 AM Nick Desaulniers
<ndesaulniers@...gle.com> wrote:
>
> On Mon, Nov 23, 2020 at 10:50 AM Greg Kroah-Hartman
> <gregkh@...uxfoundation.org> wrote:
> >
> > On Mon, Nov 23, 2020 at 10:31:10AM -0800, Nick Desaulniers wrote:
> > > Doesn't this depend on a v2 of
> > > https://lore.kernel.org/lkml/fe040988-c076-8dec-8268-3fbaa8b39c0f@infradead.org/
> > > ? Oh, looks like v1 got picked up:
> > > https://lore.kernel.org/lkml/mhng-8c56f671-512a-45e7-9c94-fa39a80451da@palmerdabbelt-glaptop1/.
> > > Won't this break RISCV VDSO?
> >
> > Oops, let me drop this, I did so in the past for 5.9.y and it looks like
> > Sasha missed that and added the fixed patch to 5.4.y...
>
> No worries, I plan to email backports directly to stable with the
> dependencies sorted out. Probably after Thanksgiving. Thanks Greg!

Re-responding in this thread as well (sorry for the double post, looks
like lkml and stable are cc'ed on this at least and not on the other
thread, so with this we should have lore links FWIW).
Please see attached patches and notes
https://github.com/ClangBuiltLinux/linux/issues/1202.

--
Thanks,
~Nick Desaulniers

View attachment "3347acc6fcd4.4.19.patch.txt" of type "text/plain" (5659 bytes)

View attachment "3347acc6fcd4.5.4.patch.txt" of type "text/plain" (5579 bytes)

View attachment "3347acc6fcd4.5.9.patch.txt" of type "text/plain" (5785 bytes)