linux-kernel - Re: [PATCH] x86/boot/compressed/64: Define __force_order only when CONFIG_RANDOMIZE

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Message-ID: <CAMKF1sqvEH94Abv2Ptz3XTCg6hGk9tQ1Dr86RwYn+bpSLQVyxg@mail.gmail.com>
Date:   Mon, 23 Dec 2019 14:25:02 -0800
From:   Khem Raj <raj.khem@...il.com>
To:     "Kirill A. Shutemov" <kirill@...temov.name>
Cc:     linux-kernel@...r.kernel.org,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Kees Cook <keescook@...omium.org>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>, x86-ml <x86@...nel.org>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] x86/boot/compressed/64: Define __force_order only when
 CONFIG_RANDOMIZE_BASE is unset

On Mon, Dec 23, 2019 at 9:10 AM Kirill A. Shutemov <kirill@...temov.name> wrote:
>
> On Sat, Dec 21, 2019 at 07:18:13AM -0800, Khem Raj wrote:
> > Since arch/x86/boot/compressed/Makefile overrides global CFLAGS it loses
> > -fno-common option which would have caught this
>
> If this doesn't cause any visible problems, why bother?
>

it does break builds with gcc trunk as of now e.g.

> Hopefully, we will be able to drop it altogether once we ditch GCC 4.X
> support.
>

gcc10 is switching defaults to -fno-common so we need to solve this one way or
other, I am not sure if gcc 4.x will be dropped before gcc10 release
which would be
in mid of 2020

> --
>  Kirill A. Shutemov