Re: [PATCH 2/3] of: Support hashtable lookups for phandles

[Geert Uytterhoeven <geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org>]

Hi Pantelis,

On Mon, May 9, 2016 at 8:11 PM, Pantelis Antoniou
<pantelis.antoniou-OWPKS81ov/FWk0Htik3J/w@public.gmane.org> wrote:
> --- a/drivers/of/base.c
> +++ b/drivers/of/base.c

> @@ -1073,9 +1097,14 @@ struct device_node *of_find_node_by_phandle(phandle handle)
>                 return NULL;
>
>         raw_spin_lock_irqsave(&devtree_lock, flags);
> -       for_each_of_allnodes(np)
> -               if (np->phandle == handle)
> -                       break;
> +       /* when we're ready use the hash table */
> +       if (of_phandle_ht_available() && !in_interrupt())

I guess the !in_interrupt() test is because of the locking inside
rhashtable_lookup_fast()?

> +               np = of_phandle_ht_lookup(handle);
> +       else { /* fallback */
> +               for_each_of_allnodes(np)
> +                       if (np->phandle == handle)
> +                               break;
> +       }

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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