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Subject: Re: [PATCH] compiler.h: Raise minimum version of GCC to 5.1 for
 arm64
From:   Joe Perches <joe@perches.com>
To:     Linus Torvalds <torvalds@linux-foundation.org>
Cc:     Ard Biesheuvel <ardb@kernel.org>,
        Russell King - ARM Linux admin <linux@armlinux.org.uk>,
        Florian Weimer <fweimer@redhat.com>,
        Arnd Bergmann <arnd@kernel.org>,
        "Cc: Android Kernel" <kernel-team@android.com>,
        Theodore Ts'o <tytso@mit.edu>,
        Peter Zijlstra <peterz@infradead.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Masahiro Yamada <masahiroy@kernel.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Will Deacon <will@kernel.org>,
        linux-arm-kernel <linux-arm-kernel@lists.infradead.org>
Date:   Thu, 14 Jan 2021 16:30:45 -0800
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On Thu, 2021-01-14 at 13:18 -0800, Linus Torvalds wrote:
> On Thu, Jan 14, 2021 at 11:52 AM Joe Perches <joe@perches.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.