On Wed, 2013-10-23 at 00:07 -0500, Kumar Gala wrote:
> On Oct 18, 2013, at 2:38 AM, Wolfgang Denk wrote:
> > diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
> > index f783c93..f330374 100644
> > --- a/arch/powerpc/kernel/traps.c
> > +++ b/arch/powerpc/kernel/traps.c
> > @@ -986,6 +986,13 @@ static int emulate_instruction(struct pt_regs *regs)
> > return 0;
> > }
> >
> > + /* Emulating the lwsync insn as a sync insn */
> > + if (instword == PPC_INST_LWSYNC) {
> > + PPC_WARN_EMULATED(lwsync, regs);
> > + asm volatile("sync" : : : "memory");
>
> Do we really need the inline asm? Doesn't the fact of just taking an
> exception and returning from it equate to a sync.
No, it doesn't equate to a sync. See the discussion here:
http://patchwork.ozlabs.org/patch/256747/
-Scott
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