On Tue, 2 Jun 2015, James Hogan wrote:
> > diff --git a/arch/mips/include/asm/barrier.h
> > b/arch/mips/include/asm/barrier.h
> > index 2b8bbbcb9be0..d2a63abfc7c6 100644
> > --- a/arch/mips/include/asm/barrier.h
> > +++ b/arch/mips/include/asm/barrier.h
> > @@ -96,9 +96,15 @@
> > # define smp_rmb() barrier()
> > # define smp_wmb() __syncw()
> > # else
> > +# ifdef CONFIG_MIPS_LIGHTWEIGHT_SYNC
> > +# define smp_mb() __asm__ __volatile__("sync 0x10" : : :"memory")
> > +# define smp_rmb() __asm__ __volatile__("sync 0x13" : : :"memory")
> > +# define smp_wmb() __asm__ __volatile__("sync 0x4" : : :"memory")
>
> 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.
Maciej
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