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From: Qais Yousef <qais.yousef@arm.com>
To: Arvind Sankar <nivedita@alum.mit.edu>
Cc: 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>,
	Arnd Bergmann <arnd@arndb.de>,
	Peter Oberparleiter <oberpar@linux.ibm.com>,
	Masahiro Yamada <masahiroy@kernel.org>
Subject: Re: [PATCH v2 00/10] Rework READ_ONCE() to improve codegen
Date: Sun, 26 Jan 2020 01:10:03 +0000
Message-ID: <20200126010959.vhq7mg4esoq5w26j@e107158-lin.cambridge.arm.com> (raw)
In-Reply-To: <20200123190125.GA2683468@rani.riverdale.lan>

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:
> > >
> > > From: Will Deacon
> > > > Sent: 23 January 2020 17:17
> > > >
> > > > I think it depends how much we care about those older compilers. My series
> > > > first moves it to "Good luck mate, you're on your own" and then follows up
> > 
> > I wish the actual warning was worded that way. :P
> > 
> > > > with a "Let me take that off you it's sharp".
> > 
> > > Oh - and I need to find a newer compiler :-(
> > 
> > What distro are you using? Does it have a package for a newer
> > compiler?  I'm honestly curious about what policies if any the kernel
> > has for supporting developer's toolchains from their distributions.
> > (ie. Arnd usually has pretty good stats what distro's use which
> > version of GCC and are still supported; Do we strive to not break
> > them? Is asking kernel devs to compile their own toolchain too much to
> > ask?  Is it still if they're using really old distro's/toolchains that
> > we don't want to support?  Do we survey kernel devs about what they're
> > using?).  Apologies if this is already documented somewhere, but if
> > not I'd eventually like to brainstorm and write it down somewhere in
> > the tree.  Documentation/process/changes.rst doesn't really answer the
> > above questions, I think.
> > 
> > -- 
> > Thanks,
> > ~Nick Desaulniers
> 
> 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.

So popular archs would probably have moved quickly, but 'niche' ones might
still be catching up at a slower pace.

--
Qais Yousef

  parent 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 [this message]
2020-01-27  7:26             ` Arnd Bergmann
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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