linux-kernel - Re: section mismatch with a platform driver

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Date:	Tue, 14 Oct 2008 04:22:48 +0800
From:	sniper <s3c24xx@...il.com>
To:	"Neshama Parhoti" <pneshama@...il.com>
Cc:	"Randy Dunlap" <randy.dunlap@...cle.com>,
	"Adrian Bunk" <bunk@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: section mismatch with a platform driver

There are some examples in kernel as following:

static struct platform_driver my_platform_driver = {
       .probe          = my_probe_func,
       .remove         = __devexit_p(my_remove),
       .suspend        = my_suspend,
       .resume         = my_resume,
       .driver         = {
               .name = DRIVER_NAME,
       },
};


static int __devinit my_probe_func(struct platform_device *pdev)
{
       return 0;
}

note that my_platform_*driver*, it let this variable can refer to
init/exit sections.
You can find the explanation in /scripts/mod/modpost.c:

/* symbols in .data that may refer to init/exit sections */
static const char *symbol_white_list[] =
{
	"*driver",
	"*_template", /* scsi uses *_template a lot */
	"*_timer",    /* arm uses ops structures named _timer a lot */
	"*_sht",      /* scsi also used *_sht to some extent */
	"*_ops",
	"*_probe",
	"*_probe_one",
	"*_console",
	NULL
};


On Tue, Oct 14, 2008 at 2:58 AM, Neshama Parhoti <pneshama@...il.com> wrote:
> On Mon, Oct 13, 2008 at 6:31 PM, Randy Dunlap <randy.dunlap@...cle.com> wrote:
>>> Does that mean that all drivers with __init in their probe functions are bogus ?
>>
>> It depends.  If your platform doesn't support hotplug, then it's possible
>> that the probe function is only called during system init, so it would be OK.
>
> Hmm any idea then why did it give me a section mismatch warning ?
>
> Thanks!!
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