Re: [PATCH] x86 bitops.h commentary on instruction reordering

[Zwane Mwaikambo]

On Fri, 6 Aug 2004, H. Peter Anvin wrote:

> Followup to:  <20040806170931.GA21683@xxxxxxxxxx>
> By author:    Marcelo Tosatti <marcelo.tosatti@xxxxxxxxxxxx>
> In newsgroup: linux.dev.kernel
> > > >
> > > >Yes correct. *mb() usually imply barrier().
> > > >
> > > >About the flush, each architecture defines its own instruction for doing
> > > >so,
> > > > PowerPC has  "sync" and "isync" instructions (to flush the whole cache
> > > > and instruction cache respectively), MIPS has "sync" and so on..
> > >
> > > So, there is no platform independent way for doing that in the kernel?
> >
> > Not really. x86 doesnt have such an instruction.
> >
>
> Actually it does (sfence, lfence, mfence); they only apply to SSE
> loads and stores since all other x86 operations are guaranteed to be
> strictly ordered.

How about the, rather brutal, wbinvd?
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