linux-kernel - Re: [PATCH v6 13/29] arm64/build: Assert for unwanted sections

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Message-ID: <20201027212425.GD1833548@rani.riverdale.lan>
Date:   Tue, 27 Oct 2020 17:24:25 -0400
From:   Arvind Sankar <nivedita@...m.mit.edu>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Arvind Sankar <nivedita@...m.mit.edu>,
        Ard Biesheuvel <ardb@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Kees Cook <keescook@...omium.org>,
        Ingo Molnar <mingo@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Mark Rutland <mark.rutland@....com>,
        Peter Collingbourne <pcc@...gle.com>,
        James Morse <james.morse@....com>,
        Borislav Petkov <bp@...e.de>, Ingo Molnar <mingo@...hat.com>,
        Russell King <linux@...linux.org.uk>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Nathan Chancellor <natechancellor@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        the arch/x86 maintainers <x86@...nel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Linux-Arch <linux-arch@...r.kernel.org>,
        linux-efi <linux-efi@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        kernel-toolchains@...r.kernel.org,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Subject: Re: [PATCH v6 13/29] arm64/build: Assert for unwanted sections

On Tue, Oct 27, 2020 at 01:40:43PM -0700, Nick Desaulniers wrote:
> On Tue, Oct 27, 2020 at 1:30 PM Arvind Sankar <nivedita@...m.mit.edu> wrote:
> >
> > On Tue, Oct 27, 2020 at 01:17:55PM -0700, Nick Desaulniers wrote:
> > > > >  (I feel the same about there
> > > > > being an empty asm(); statement in the definition of asm_volatile_goto
> > > > > for compiler-gcc.h).  Might be time to "fix the compiler."
> > > > >
> > > > > (It sounds like Arvind is both in agreement with my sentiment, and has
> > > > > the root cause).
> > > > >
> > Btw, the bug mentioned in asm_volatile_goto seems like its been fixed in
> > 4.9, so the hack could be dropped now?
> 
> https://lore.kernel.org/lkml/20180907222109.163802-1-ndesaulniers@google.com/
> 
> For the life of me I can't find Linus' response.  Maybe he shot it
> down in the PR, but I can't find it...Miguel do you recall?  I could
> paraphrase, but might be better to not rely on my memory.
> -- 
> Thanks,
> ~Nick Desaulniers

You couldn't find it in July either :)
https://lkml.org/lkml/2020/7/10/1026

Possibly he didn't like the version check? That should be unnecessary now.