linux-kernel - Re: [RFC] arch: Introduce new TSO memory barrier smp

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Message-ID: <CAMuHMdXZjQJvT7R4ODbDNBgAVwPUBPjB6UoR66_sNuFx7opUDw@mail.gmail.com>
Date:	Wed, 6 Nov 2013 13:51:10 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Victor Kaplansky <VICTORK@...ibm.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Anton Blanchard <anton@...ba.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux PPC dev <linuxppc-dev@...abs.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Michael Ellerman <michael@...erman.id.au>,
	Michael Neuling <mikey@...ling.org>,
	Russell King <linux@....linux.org.uk>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Tony Luck <tony.luck@...el.com>
Subject: Re: [RFC] arch: Introduce new TSO memory barrier smp_tmb()

On Wed, Nov 6, 2013 at 1:39 PM, Peter Zijlstra <peterz@...radead.org> wrote:
>  Documentation/memory-barriers.txt     |  157 +++++++++++++++++-----------------
>  arch/alpha/include/asm/barrier.h      |   15 +++
>  arch/arc/include/asm/barrier.h        |   15 +++
>  arch/arm/include/asm/barrier.h        |   15 +++
>  arch/arm64/include/asm/barrier.h      |   50 ++++++++++
>  arch/avr32/include/asm/barrier.h      |   14 +++
>  arch/blackfin/include/asm/barrier.h   |   15 +++
>  arch/cris/include/asm/barrier.h       |   15 +++
>  arch/frv/include/asm/barrier.h        |   15 +++
>  arch/h8300/include/asm/barrier.h      |   15 +++
>  arch/hexagon/include/asm/barrier.h    |   15 +++
>  arch/ia64/include/asm/barrier.h       |   49 ++++++++++
>  arch/m32r/include/asm/barrier.h       |   15 +++
>  arch/m68k/include/asm/barrier.h       |   15 +++
>  arch/metag/include/asm/barrier.h      |   15 +++
>  arch/microblaze/include/asm/barrier.h |   15 +++
>  arch/mips/include/asm/barrier.h       |   15 +++
>  arch/mn10300/include/asm/barrier.h    |   15 +++
>  arch/parisc/include/asm/barrier.h     |   15 +++
>  arch/powerpc/include/asm/barrier.h    |   21 ++++
>  arch/s390/include/asm/barrier.h       |   15 +++
>  arch/score/include/asm/barrier.h      |   15 +++
>  arch/sh/include/asm/barrier.h         |   15 +++
>  arch/sparc/include/asm/barrier_32.h   |   15 +++
>  arch/sparc/include/asm/barrier_64.h   |   15 +++
>  arch/tile/include/asm/barrier.h       |   15 +++
>  arch/unicore32/include/asm/barrier.h  |   15 +++
>  arch/x86/include/asm/barrier.h        |   15 +++
>  arch/xtensa/include/asm/barrier.h     |   15 +++
>  include/linux/compiler.h              |    9 +
>  30 files changed, 581 insertions(+), 79 deletions(-)

This is screaming for a default implementation in asm-generic.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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