Re: [PATCH 1/3] MIPS: R6: Use lightweight SYNC instruction in smp_* memory barriers

[Leonid Yegoshin]

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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