linux-kernel - Re: [PATCH] ASoC: rt5645: fix build warning

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Date:	Thu, 8 Oct 2015 14:25:50 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	Bard Liao <bardliao@...ltek.com>,
	Oder Chiou <oder_chiou@...ltek.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>, linux-kernel@...r.kernel.org,
	alsa-devel@...a-project.org
Subject: Re: [PATCH] ASoC: rt5645: fix build warning

On Wed, Oct 07, 2015 at 03:05:27PM +0100, Mark Brown wrote:
> On Wed, Oct 07, 2015 at 05:52:12PM +0530, Sudip Mukherjee wrote:
> > We were getting build warning about "Section mismatch".
> > dmi_platform_intel_broadwell is being referenced from the probe function
> > rt5645_i2c_probe(), but dmi_platform_intel_broadwell was marked with
> > __initdata.
> > 
> > Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>
> 
> > -static struct dmi_system_id dmi_platform_intel_broadwell[] __initdata = {
> > +static struct dmi_system_id dmi_platform_intel_broadwell[] = {
> 
> This doesn't seem like the obvious fix - why are we not annotating the
> probe function suitably (or alternatively if we can't why does
> __initdata still exist)?

probe function should not be __init. probe can be called anytime after
the module has been loaded.
__initdata still exists as that part of the code was added by
e9159e7577cf ("ASoC: rt5645: Add dmi for Broadwell") which is a very
recent modification and I think that has been added by mistake.
One more argument in my favor:
The use in probe function is 
if (dmi_check_system(dmi_platform_intel_braswell) || 
		dmi_check_system(dmi_platform_intel_broadwell))

dmi_platform_intel_braswell is not marked as __initdata but
dmi_platform_intel_broadwell is marked but they both have same use at
the same place.

regards
sudip
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