linux-kernel - Re: [PATCH] compiler.h: Raise minimum version of GCC to 5.1 for arm64

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Message-ID: <eabb211c3ba394845ec3258d86406137f4c23b33.camel@perches.com>
Date:   Thu, 14 Jan 2021 16:30:45 -0800
From:   Joe Perches <joe@...ches.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Ard Biesheuvel <ardb@...nel.org>,
        Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Florian Weimer <fweimer@...hat.com>,
        Arnd Bergmann <arnd@...nel.org>,
        "Cc: Android Kernel" <kernel-team@...roid.com>,
        Theodore Ts'o <tytso@....edu>,
        Peter Zijlstra <peterz@...radead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Will Deacon <will@...nel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] compiler.h: Raise minimum version of GCC to 5.1 for
 arm64

On Thu, 2021-01-14 at 13:18 -0800, Linus Torvalds wrote:
> On Thu, Jan 14, 2021 at 11:52 AM Joe Perches <joe@...ches.com> wrote:
> > 
> > Given the upgrade requirement, and how clang version requirements
> > constantly change, how much more difficult would it be for others
> > to use gcc 7.1 or higher now instead of later?
> 
> What was the argument for jumping all the way to gcc-7.1?
> 
> I do think we want to have real reasons we can point to, rather than a
> "just because".

KASAN v5 instead of all the old versions
gcc 7.1 supports fallthrough.

Probably more, but those might be sufficient.