linux-kernel - Re: [PATCH 03/20] pinctrl: Store mapping table as a list of chunks

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Date:	Mon, 20 Feb 2012 22:08:00 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Stephen Warren <swarren@...dia.com>
Cc:	Linus Walleij <linus.walleij@...ricsson.com>, B29396@...escale.com,
	s.hauer@...gutronix.de, dongas86@...il.com, shawn.guo@...aro.org,
	thomas.abraham@...aro.org, tony@...mide.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/20] pinctrl: Store mapping table as a list of chunks

On Mon, Feb 20, 2012 at 7:45 AM, Stephen Warren <swarren@...dia.com> wrote:

> Instead of storing a single array of mapping table entries, which
> requires realloc()ing that array each time it's extended and copying
> the new data, simply store a list of pointers to the individual chunks.
> This also removes the need to copy the mapping table at all; a pointer
> is maintained to the original table, this saving memory.
>
> A macro for_each_maps() is introduced to hide the additional complexity
> of iterating over the map entries.
>
> This change will also simplify removing chunks of entries from the mapping
> table. This isn't important right now, but will be in the future, when
> mapping table entries are dynamically added when parsing them from the
> device tree, and removed when drivers no longer need to interact with
> pinctrl.
>
> Signed-off-by: Stephen Warren <swarren@...dia.com>
> ---
> v2: Fixed kzalloc size parameter in pinctrl_register_mappings(),
>    add pr_error on kzalloc() failure, keep pinctrl_get() docs with
>    pinctrl_get() not pinctrl_get_locked(), make pinctrl_get_locked()
>    static, use list_add_tail instead of list_add, continue to duplicate
>    mapping table, don't remove __initdata from u300 mapping table.

Brilliant, applied.
Also tested on U300 up to this point, everything works just fine.

Thanks,
Linus Walleij
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