linux-kernel - Re: [PATCH] of/irq: optimize device node matching loop in of_irq

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Date:	Sun, 6 Dec 2015 14:44:11 -0600
From:	Rob Herring <robh+dt@...nel.org>
To:	Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Frank Rowand <frowand.list@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Grant Likely <grant.likely@...aro.org>
Subject: Re: [PATCH] of/irq: optimize device node matching loop in of_irq_init()

On Tue, Nov 24, 2015 at 7:10 AM, Masahiro Yamada
<yamada.masahiro@...ionext.com> wrote:
> Currently, of_irq_init() iterates over interrupt controller nodes
> with for_each_matching_node(), and then gets each init function with
> of_match_node() later.
>
> This routine can be optimized with for_each_matching_node_and_match().
> It allows to get the interrupt controller node and its init function
> at the same time, saving __of_match_node() callings.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>

Applied, thanks.

Rob

> ---
>
>  drivers/of/irq.c | 27 +++++++++++++--------------
>  1 file changed, 13 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/of/irq.c b/drivers/of/irq.c
> index 902b89b..4c0da87 100644
> --- a/drivers/of/irq.c
> +++ b/drivers/of/irq.c
> @@ -472,6 +472,7 @@ EXPORT_SYMBOL_GPL(of_irq_to_resource_table);
>
>  struct of_intc_desc {
>         struct list_head        list;
> +       of_irq_init_cb_t        irq_init_cb;
>         struct device_node      *dev;
>         struct device_node      *interrupt_parent;
>  };
> @@ -485,6 +486,7 @@ struct of_intc_desc {
>   */
>  void __init of_irq_init(const struct of_device_id *matches)
>  {
> +       const struct of_device_id *match;
>         struct device_node *np, *parent = NULL;
>         struct of_intc_desc *desc, *temp_desc;
>         struct list_head intc_desc_list, intc_parent_list;
> @@ -492,10 +494,15 @@ void __init of_irq_init(const struct of_device_id *matches)
>         INIT_LIST_HEAD(&intc_desc_list);
>         INIT_LIST_HEAD(&intc_parent_list);
>
> -       for_each_matching_node(np, matches) {
> +       for_each_matching_node_and_match(np, matches, &match) {
>                 if (!of_find_property(np, "interrupt-controller", NULL) ||
>                                 !of_device_is_available(np))
>                         continue;
> +
> +               if (WARN(!match->data, "of_irq_init: no init function for %s\n",
> +                        match->compatible))
> +                       continue;
> +
>                 /*
>                  * Here, we allocate and populate an of_intc_desc with the node
>                  * pointer, interrupt-parent device_node etc.
> @@ -506,6 +513,7 @@ void __init of_irq_init(const struct of_device_id *matches)
>                         goto err;
>                 }
>
> +               desc->irq_init_cb = match->data;
>                 desc->dev = of_node_get(np);
>                 desc->interrupt_parent = of_irq_find_parent(np);
>                 if (desc->interrupt_parent == np)
> @@ -525,27 +533,18 @@ void __init of_irq_init(const struct of_device_id *matches)
>                  * The assumption is that NULL parent means a root controller.
>                  */
>                 list_for_each_entry_safe(desc, temp_desc, &intc_desc_list, list) {
> -                       const struct of_device_id *match;
>                         int ret;
> -                       of_irq_init_cb_t irq_init_cb;
>
>                         if (desc->interrupt_parent != parent)
>                                 continue;
>
>                         list_del(&desc->list);
> -                       match = of_match_node(matches, desc->dev);
> -                       if (WARN(!match->data,
> -                           "of_irq_init: no init function for %s\n",
> -                           match->compatible)) {
> -                               kfree(desc);
> -                               continue;
> -                       }
>
> -                       pr_debug("of_irq_init: init %s @ %p, parent %p\n",
> -                                match->compatible,
> +                       pr_debug("of_irq_init: init %s (%p), parent %p\n",
> +                                desc->dev->full_name,
>                                  desc->dev, desc->interrupt_parent);
> -                       irq_init_cb = (of_irq_init_cb_t)match->data;
> -                       ret = irq_init_cb(desc->dev, desc->interrupt_parent);
> +                       ret = desc->irq_init_cb(desc->dev,
> +                                               desc->interrupt_parent);
>                         if (ret) {
>                                 kfree(desc);
>                                 continue;
> --
> 1.9.1
>
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