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

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Message-ID: <CAMuHMdXBnxTaKB4io4j4jbbUh+QU0b_Fj8zYi_K_7NZSE33YpQ@mail.gmail.com>
Date:	Mon, 9 May 2016 22:38:20 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Pantelis Antoniou <pantelis.antoniou@...sulko.com>
Cc:	Rob Herring <robherring2@...il.com>,
	Frank Rowand <frowand.list@...il.com>,
	Matt Porter <mporter@...sulko.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Koen Kooi <koen@...inion.thruhere.net>,
	Guenter Roeck <linux@...ck-us.net>,
	Marek Vasut <marex@...x.de>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Pantelis Antoniou <panto@...oniou-consulting.com>
Subject: Re: [PATCH 2/3] of: Support hashtable lookups for phandles

Hi Pantelis,

On Mon, May 9, 2016 at 8:11 PM, Pantelis Antoniou
<pantelis.antoniou@...sulko.com> 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@...ux-m68k.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