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

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Date:   Thu, 13 Sep 2018 06:02:54 +0200
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Stefan Agner <stefan@...er.ch>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        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>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Paul Lawrence <paullawrence@...gle.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] include/linux/compiler-clang.h: define __naked

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

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