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From: Arnd Bergmann <arnd@arndb.de>
To: Qais Yousef <qais.yousef@arm.com>
Cc: Arvind Sankar <nivedita@alum.mit.edu>,
	Nick Desaulniers <ndesaulniers@google.com>,
	David Laight <David.Laight@aculab.com>,
	Will Deacon <will@kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>,
	"kernel-team@android.com" <kernel-team@android.com>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Peter Zijlstra <peterz@infradead.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Segher Boessenkool <segher@kernel.crashing.org>,
	Christian Borntraeger <borntraeger@de.ibm.com>,
	Luc Van Oostenryck <luc.vanoostenryck@gmail.com>,
	Peter Oberparleiter <oberpar@linux.ibm.com>,
	Masahiro Yamada <masahiroy@kernel.org>
Subject: Re: [PATCH v2 00/10] Rework READ_ONCE() to improve codegen
Date: Mon, 27 Jan 2020 08:26:03 +0100
Message-ID: <CAK8P3a2P41JjO8=GTSVL9WVEfjA_M+StH7Ons27SqSNK2JOrHg@mail.gmail.com> (raw)
In-Reply-To: <20200126010959.vhq7mg4esoq5w26j@e107158-lin.cambridge.arm.com>

On Sun, Jan 26, 2020 at 2:10 AM Qais Yousef <qais.yousef@arm.com> wrote:
> On 01/23/20 14:01, Arvind Sankar wrote:
> > On Thu, Jan 23, 2020 at 10:45:08AM -0800, Nick Desaulniers wrote:
> > > On Thu, Jan 23, 2020 at 9:32 AM David Laight <David.Laight@aculab.com> wrote:
> >
> > Reposting Arnd's link
> > https://www.spinics.net/lists/linux-kbuild/msg23648.html
>
> This list seems to be x86 centric? I remember when the switch to GCC 4.6
> happened a couple or more archs had to be dropped because they lacked a newer
> compiler.

There are two architectures that already had problems last time:

- unicore32 never had any compiler that shipped with sources, only an ancient
  set of gcc binaries that already had problems building the kernel during the
  move to gcc-4.6. The maintainer said he'd work on providing support for
  modern gcc or clang, but I don't think anything came out of that.

- hexagon had an unmaintained gcc-4.5 port, but internally Qualcomm were
  already using clang to build their kernels, which should now work with the
  upstream version. I don't think there are any plans to have a more modern
  gcc.

Everything else works with mainline gcc now, openrisc and csky were the
last to get added in gcc-9.

Some of the older sub-targets (armv3, s390-g6, powerpcspe) are removed
in gcc-9, but these have a few more years before we need to worry about
them.

     Arnd

  reply index

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-23 15:33 Will Deacon
2020-01-23 15:33 ` [PATCH v2 01/10] compiler/gcc: Emit build-time warning for GCC prior to version 4.8 Will Deacon
2020-01-23 15:33 ` [PATCH v2 02/10] netfilter: Avoid assigning 'const' pointer to non-const pointer Will Deacon
2020-01-23 19:07   ` Nick Desaulniers
2020-01-24  8:24     ` Peter Zijlstra
2020-01-24 17:20       ` Nick Desaulniers
2020-01-27 12:04         ` David Laight
2020-01-24 17:36       ` Linus Torvalds
2020-01-24 22:00         ` Peter Zijlstra
2020-01-27 12:21         ` David Laight
2020-01-23 15:33 ` [PATCH v2 03/10] fault_inject: Don't rely on "return value" from WRITE_ONCE() Will Deacon
2020-01-23 15:33 ` [PATCH v2 04/10] READ_ONCE: Simplify implementations of {READ,WRITE}_ONCE() Will Deacon
2020-01-23 15:33 ` [PATCH v2 05/10] READ_ONCE: Enforce atomicity for {READ,WRITE}_ONCE() memory accesses Will Deacon
2020-01-25  8:27   ` Peter Zijlstra
2020-01-29 10:49     ` Peter Zijlstra
2020-01-23 15:33 ` [PATCH v2 06/10] READ_ONCE: Drop pointer qualifiers when reading from scalar types Will Deacon
2020-01-23 15:33 ` [PATCH v2 07/10] locking/barriers: Use '__unqual_scalar_typeof' for load-acquire macros Will Deacon
2020-01-23 15:33 ` [PATCH v2 08/10] arm64: barrier: Use '__unqual_scalar_typeof' for acquire/release macros Will Deacon
2020-01-23 15:33 ` [PATCH v2 09/10] compiler/gcc: Raise minimum GCC version for kernel builds to 4.8 Will Deacon
2020-01-23 18:36   ` Nick Desaulniers
2020-01-24  8:26     ` Peter Zijlstra
2020-01-24 17:05       ` Nick Desaulniers
2020-01-24 23:29         ` Peter Zijlstra
2020-01-25 10:34         ` Michael Ellerman
2020-01-23 15:33 ` [PATCH v2 10/10] gcov: Remove old GCC 3.4 support Will Deacon
2020-01-23 18:51   ` Nick Desaulniers
2020-01-28 14:56   ` Peter Oberparleiter
2020-01-23 17:07 ` [PATCH v2 00/10] Rework READ_ONCE() to improve codegen David Laight
2020-01-23 17:16   ` Will Deacon
2020-01-23 17:32     ` David Laight
2020-01-23 18:45       ` Nick Desaulniers
2020-01-23 19:01         ` Arvind Sankar
2020-01-24 10:11           ` David Laight
2020-01-26  1:10           ` Qais Yousef
2020-01-27  7:26             ` Arnd Bergmann [this message]
2020-01-23 17:59 ` Linus Torvalds
2020-01-24  8:33   ` Peter Zijlstra
2020-01-24 10:41     ` Peter Zijlstra
2020-02-10  9:50     ` Masahiro Yamada
2020-02-10  9:59       ` Will Deacon
2020-01-31 10:20 ` David Howells

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