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SubjectRe: [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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