linux-kernel - Re: [PATCH] [firmware_class] Fix compile with no builtin firmware

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Message-ID: <20121121093528.4fe11c26@tom-ThinkPad-T410>
Date:	Wed, 21 Nov 2012 09:35:28 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Solomon Peachy <pizza@...ftnet.org>
Cc:	Greg KH <gregkh@...uxfoundation.org>, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH] [firmware_class] Fix compile with no builtin firmware

On Tue, 20 Nov 2012 13:12:03 -0500
Solomon Peachy <pizza@...ftnet.org> wrote:

> On Tue, Nov 20, 2012 at 08:33:09AM -0800, Greg KH wrote:
> > > The corresponding .config is attached.  Note that it is for a uClinux 
> > > 3.3.0-uc0 kernel.
> > 
> > Lots of things have changed in the firmware code since 3.3.0, can you
> > retest this on the 3.7-rc6 tree?

Solomon, I can't duplicate the build failure with your .config on 3.7-rc5-next.

> 
> Not easily; My employer is contracted to do some driver porting and 
> we're stuck with the kernel the client provided.  However, the patch is 
> still relevant for upstream, because the underlying problem still 
> exists:
>  
>  * The #ifdef wraps code that pertains solely to built-in firmware, (ie 
>    CONFIG_FIRMWARE_IN_KERNEL) and has an #else path for when it's disabled.
>  * There is no point in a CONFIG_FW_LOADER test inside firmware_class.c 
>    when the file isn't even compiled unless CONFIG_FW_LOADER is defined.

Enabling CONFIG_EXTRA_FIRMWARE still can make one firmware built in kernel
even though CONFIG_FIRMWARE_IN_KERNEL isn't defined, so your patch will break
this case.

> 
> Perhaps the compile problem is solved in newer kernels (by always 
> generating an empty builtin firmware list?) but the #ifdef is still 
> incorrect.

Looks the problem hasn't been reported before.


Thanks,
-- 
Ming Lei
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