linux-kernel - Re: [PATCH] include/linux/compiler-clang.h: define _

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Message-ID: <CAKwvOdkgdbn76+jGEwUayGriGn+4GQVLtxkzszkBueP6XuOGLw@mail.gmail.com>
Date:   Thu, 13 Sep 2018 15:20:07 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc:     Arnd Bergmann <arnd@...db.de>, Stefan Agner <stefan@...er.ch>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Will Deacon <will.deacon@....com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>, dwmw@...zon.co.uk,
        Paul Lawrence <paullawrence@...gle.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [PATCH] include/linux/compiler-clang.h: define __naked

On Wed, Sep 12, 2018 at 9:03 PM Miguel Ojeda
<miguel.ojeda.sandonis@...il.com> wrote:
>
> Hi again,
>
> On Wed, Sep 12, 2018 at 6:19 AM, Miguel Ojeda
> <miguel.ojeda.sandonis@...il.com> wrote:
> >
> > I will do a bigger one tomorrow or so and see if there are any
> > important differences. Regardless of what we do, I will send the
> > __naked patches separately as well (requested by Nick on GitHub).
>
> So I did a comparison with a full allyesconfig between -rc2 and -rc2 +
> v4. I find quite a lot binary differences, but not a single objdump -d
> difference (object file by object file) just by fixing UTS_RELEASE to
> the same value, so I guess that is a very good sign in case someone
> wants to pick the entire series sooner than expected. Regardless, I
> will send the separate __naked patches.
>
> I should note that, at some point in one of my allyesconfig builds I got this:
>
>   UPD     include/generated/compile.h
>   CC      init/version.o
>   AR      init/built-in.a
>   AR      built-in.a
>   LD      vmlinux.o
>   MODPOST vmlinux.o
> ld: drivers/edac/amd64_edac.o(.text+0x200031d2): reloc against
> `__asan_load4_noabort': error 4
> ld: final link failed: Nonrepresentable section on output
> Makefile:1035: recipe for target 'vmlinux' failed
> make: *** [vmlinux] Error 1

+ Dmitry for the KASAN error (Andrey was already cc'ed)

>
> Running make (without cleaning) didn't reproduce it, and the other
> allyesconfig builds didn't suffer any problem either. Maybe my
> hardware is failing, but I wanted to let you know nevertheless.
>
> Cheers,
> Miguel



-- 
Thanks,
~Nick Desaulniers