linux-kernel - Re: [PATCH] usb: gadget: fotg210-udc: Remove bogus __init/_

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Message-ID: <51E078AD.1050508@cogentembedded.com>
Date:	Sat, 13 Jul 2013 01:44:13 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
CC:	Yuan-Hsin Chen <yhchen@...aday-tech.com>,
	Felipe Balbi <balbi@...com>,
	USB list <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb: gadget: fotg210-udc: Remove bogus __init/__exit
 annotations

Hello.

On 07/11/2013 11:25 AM, Geert Uytterhoeven wrote:

>>> When builtin (CONFIG_USB_FOTG210_UDC=y):

>>>     LD      drivers/usb/gadget/built-in.o
>>> WARNING: drivers/usb/gadget/built-in.o(.data+0xbf8): Section mismatch in
>>> reference from the variable fotg210_driver to the function
>>> .init.text:fotg210_udc_probe()
>>> The variable fotg210_driver references
>>> the function __init fotg210_udc_probe()
>>> If the reference is valid then annotate the
>>> variable with __init* or __refdata (see linux/init.h) or name the
>>> variable:
>>> *_template, *_timer, *_sht, *_ops, *_probe, *_probe_one, *_console

>>> diff --git a/drivers/usb/gadget/fotg210-udc.c
>>> b/drivers/usb/gadget/fotg210-udc.c
>>> index cce5535..10cd18d 100644
>>> --- a/drivers/usb/gadget/fotg210-udc.c
>>> +++ b/drivers/usb/gadget/fotg210-udc.c
>>> @@ -1074,7 +1074,7 @@ static struct usb_gadget_ops fotg210_gadget_ops = {
>>>          .udc_stop               = fotg210_udc_stop,
>>>    };
>>>
>>> -static int __exit fotg210_udc_remove(struct platform_device *pdev)
>>> +static int fotg210_udc_remove(struct platform_device *pdev)

>>     I think you can leave __exit annotation here, if you enclose the
>> reference in the driver structure in __exit_p()...

> The driver is using module_platform_driver(), not
> module_platform_driver_probe(),
> so it expects the platform device to show up or disappear anytime.

    Well, I don't think it actually does. Perhaps the reason was that 
the latter function wasn't available yet at the time of conversion to 
the former (IIRC it appeared later).

WBR, Sergei

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