linux-kernel - Re: [v3,11/41] mips: reuse asm-generic/barrier.h

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Message-ID: <56980145.5030901@imgtec.com>
Date:	Thu, 14 Jan 2016 12:12:53 -0800
From:	Leonid Yegoshin <Leonid.Yegoshin@...tec.com>
To:	Will Deacon <will.deacon@....com>
CC:	Peter Zijlstra <peterz@...radead.org>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	<linux-kernel@...r.kernel.org>, Arnd Bergmann <arnd@...db.de>,
	<linux-arch@...r.kernel.org>,
	Andrew Cooper <andrew.cooper3@...rix.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	<virtualization@...ts.linux-foundation.org>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Joe Perches <joe@...ches.com>,
	David Miller <davem@...emloft.net>,
	<linux-ia64@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>,
	<linux-s390@...r.kernel.org>, <sparclinux@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-metag@...r.kernel.org>, <linux-mips@...ux-mips.org>,
	<x86@...nel.org>, <user-mode-linux-devel@...ts.sourceforge.net>,
	<adi-buildroot-devel@...ts.sourceforge.net>,
	<linux-sh@...r.kernel.org>, <linux-xtensa@...ux-xtensa.org>,
	<xen-devel@...ts.xenproject.org>,
	"Ralf Baechle" <ralf@...ux-mips.org>,
	Ingo Molnar <mingo@...nel.org>, <ddaney.cavm@...il.com>,
	<james.hogan@...tec.com>, Michael Ellerman <mpe@...erman.id.au>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>
Subject: Re: [v3,11/41] mips: reuse asm-generic/barrier.h

On 01/14/2016 04:04 AM, Will Deacon wrote:
> Consequently, it's important that the architecture back-ends implement 
> these portable primitives (e.g. smp_mb()) in a way that satisfies the 
> kernel memory model so that core code doesn't need to worry about the 
> underlying architecture for synchronisation purposes.

It seems you don't listen me. I said multiple times - MIPS 
implementation of SYNC_RMB/SYNC_WMB/SYNC_MB/SYNC_ACQUIRE/SYNC_RELEASE 
instructions matches the description of 
smp_rmb/smp_wmb/smp_mb/sync_acquire/sync_release from 
Documentation/memory-barriers.txt file.

What else do you want from me - RTL or microArch design for that?

- Leonid.