linux-kernel - Re: dell_rbu: Select CONFIG_FW_LOADER_USER

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Date:	Tue, 9 Jul 2013 23:06:05 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	Dave Jones <davej@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: dell_rbu: Select CONFIG_FW_LOADER_USER_HELPER explicitly

On Tue, Jul 9, 2013 at 10:45 PM, Takashi Iwai <tiwai@...e.de> wrote:
> At Tue, 9 Jul 2013 22:39:36 +0800,
> Ming Lei wrote:
>>
>> On Tue, Jul 9, 2013 at 9:32 PM, Takashi Iwai <tiwai@...e.de> wrote:
>> > At Tue, 9 Jul 2013 16:43:30 +0800,
>> >> Actually from view of distribution, dell rbu has to be compiled in, then
>> >> no code size can be saved any more, which means looks the introduced
>> >> option in this patch isn't necessary.
>> >
>> > Well, but it means that there is no way not to compile user-helper
>> > mode code in firmware_class.c.  In other words, in which condition,
>> > request_firmware_user() will be compiled?
>>
>> It can be always compiled in. Basically dell rbu is always enabled in
>> distributions, which means the user helper code has to be compiled in.
>
> But how non-distro kernel disables this being built-in...?
> Or do you suggest to enable the user-helper codes always built, no
> matter whether it's used or not?

The only cost of built-in user helper code is ~6Kbytes code on my armv7
box.

If the 6KB memory does mater for this non-distro kernel, we can introduce
more options.

Thanks,
--
Ming Lei
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