linux-kernel - Re: [PATCH] of: Turn of_match_node into a static inline when CONFIG

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Message-ID: <CAMuHMdVOkUMxEkUK70Y=Y126XmqgKMpyqmGRG5us7vZPhP8WNw@mail.gmail.com>
Date:	Wed, 12 Feb 2014 22:54:37 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Josh Cartwright <joshc@...eaurora.org>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH] of: Turn of_match_node into a static inline when
 CONFIG_OF isn't set

On Tue, Feb 11, 2014 at 9:06 PM, Arnd Bergmann <arnd@...db.de> wrote:
> On Tuesday 11 February 2014 19:29:19 Geert Uytterhoeven wrote:
>> On Tue, Feb 11, 2014 at 7:08 PM, Josh Cartwright <joshc@...eaurora.org> wrote:
>> Ideally, all xxx_device_id look like
>>
>>     struct xxx_device_id {
>>             ... /* bus-specific ID information */
>>             kernel_ulong_t driver_data;
>>     };
>>
>> This may be formalized in some way, using a base class, but thay may
>> require reordering the fields, like:
>>
>>     struct base_device_id {
>>             kernel_ulong_t driver_data;
>>             long id[0];
>>     };
>>
>
> You can't reorder the fields because they are shared with user
> space in form of the module-init-tools.

Sure, that's part of the ABI.

But that doesn't mean we can't change the ID as stored in the platform_device.
Many drivers don't want to know the ID, only the driver_data part.
Having that in a uniform way across the different ID types would help.

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
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