linux-kernel - Re: [PATCH v4 01/11] compiler/gcc: Raise minimum GCC version for kernel builds to 4.8

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Message-ID: <CAK7LNATyFAusdcsvZxOjB7vAtj7G2w6b-bWd7dJjXUoEKm=LcA@mail.gmail.com>
Date:   Wed, 22 Apr 2020 02:15:30 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Will Deacon <will@...nel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        "Cc: Android Kernel" <kernel-team@...roid.com>,
        Mark Rutland <mark.rutland@....com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Peter Zijlstra <peterz@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Segher Boessenkool <segher@...nel.crashing.org>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Peter Oberparleiter <oberpar@...ux.ibm.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH v4 01/11] compiler/gcc: Raise minimum GCC version for
 kernel builds to 4.8

On Wed, Apr 22, 2020 at 12:15 AM Will Deacon <will@...nel.org> wrote:
>
> It is very rare to see versions of GCC prior to 4.8 being used to build
> the mainline kernel. These old compilers are also know to have codegen

"know" -> "known"


> issues which can lead to silent miscompilation:
>
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58145
>
> Raise the minimum GCC version for kernel build to 4.8 and remove some
> tautological Kconfig dependencies as a consequence.
>
> Cc: Masahiro Yamada <masahiroy@...nel.org>


Maybe you can also clean up mm/migrate.c
because GCC_VERSION >= 40700 is always met.
It is up to you if you want to send v5.

Please replace CC with
Reviewed-by: Masahiro Yamada <masahiroy@...nel.org>

Thank you!

> Acked-by: Arnd Bergmann <arnd@...db.de>
> Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
> Signed-off-by: Will Deacon <will@...nel.org>
> ---


-- 
Best Regards
Masahiro Yamada