[1/2] powerpc/powernv: new function to access OPAL msglog

[Michael Ellerman]

On Tue, 2016-02-09 at 16:29 +1100, Andrew Donnellan wrote:
> On 08/02/16 22:31, Michael Ellerman wrote:
> > Pulling the memcons out of the bin_attr here is not all that nice. This routine
> > should really stand on its own without reference to the bin_attr. In theory I
> > might want to disable building sysfs but still have this routine available.
>
> Yeah it's a bit ugly, though does disabling sysfs actually break it?

Probably not, it looks like bin_attribute is still defined even when sysfs is
disabled. And the build would break in other places too.

> I can separate it out anyway - there's no reason for the memcons to be
> tied to the sysfs entry.

Yeah that was more my point.

> > It's also a bit fishy if it's called before the bin_attr is initialised or when
> > the memcons initialisation fails. In both cases it should be OK, because the
> > structs in question are static and so the private pointer will be NULL, but
> > that's a bit fragile.
> >
> > I think the solution is simply to create a:
> >
> >    static struct memcons *opal_memcons;
> >
> > And use that in opal_msglog_copy() and so on.
>
> Will respin.

Thanks.

cheers