linux-kernel - Re: [PATCH 1/3] MIPS: R6: Use lightweight SYNC instruction in smp

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Message-ID: <556E5EDC.9030209@imgtec.com>
Date:	Tue, 2 Jun 2015 18:56:44 -0700
From:	Leonid Yegoshin <Leonid.Yegoshin@...tec.com>
To:	David Daney <ddaney.cavm@...il.com>,
	"Maciej W. Rozycki" <macro@...ux-mips.org>
CC:	James Hogan <james.hogan@...tec.com>, <linux-mips@...ux-mips.org>,
	<benh@...nel.crashing.org>, <will.deacon@....com>,
	<linux-kernel@...r.kernel.org>, Ralf Baechle <ralf@...ux-mips.org>,
	<markos.chandras@...tec.com>, <Steven.Hill@...tec.com>,
	<alexander.h.duyck@...hat.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 1/3] MIPS: R6: Use lightweight SYNC instruction in smp_*
 memory barriers

On 06/02/2015 04:56 PM, David Daney wrote:
> On 06/02/2015 09:15 AM, Maciej W. Rozycki wrote:
>> On Tue, 2 Jun 2015, James Hogan wrote:
>>
>>>
>>> binutils appears to support the sync_mb, sync_rmb, sync_wmb aliases
>>> since version 2.21. Can we safely use them?
>>
>>   I suggest that we don't -- we still officially support binutils 
>> 2.12 and
>> have other places where we even use `.word' to insert instructions 
>> current
>> versions of binutils properly handle.  It may be worth noting in a 
>> comment
>> though that these encodings correspond to these operations that you 
>> named.
>>
>
> Surely the other MIPSr6 instructions are not supported in binutils 
> 2.12 either.  So if it is for r6, why not require modern tools, and 
> put something user readable in here?
>
>
No, it can be used for MIPS R2 also.

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