Re: [PATCH v2 10/10] ARM: mstar: SMP support

[Daniel Palmer]

Hi Russell,

On Wed, 2 Dec 2020 at 00:04, Russell King - ARM Linux admin
<linux@xxxxxxxxxxxxxxx> wrote:
>
> On Tue, Dec 01, 2020 at 10:43:30PM +0900, Daniel Palmer wrote:
> > +     np = of_find_compatible_node(NULL, NULL, "mstar,smpctrl");
> > +     smpctrl = of_iomap(np, 0);
> > +
> > +     if (!smpctrl)
> > +             return -ENODEV;
>
> Wouldn't -ENOMEM be more appropriate here?

There seems to be examples of both -ENOMEM and -ENODEV in other ARM platforms.
arch/arm/mach-aspeed/platsmp.c uses -ENODEV for example.

I went with -ENODEV there as the source of the error is most likely
the node not being in the device tree.
I didn't check the result of of_find_compatible_node() because for the
memory barrier code in the same file I was told it wasn't necessary.

Thanks,

Daniel