linux-kernel - Re: [PATCH 1/3] [SCSI] dpt_i2o: fix compiler warning on dptids

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Message-ID: <1291742693.1638.22.camel@leonhard>
Date:	Wed, 08 Dec 2010 02:24:53 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	James Bottomley <James.Bottomley@...e.de>
Cc:	linux-scsi@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] [SCSI] dpt_i2o: fix compiler warning on dptids

2010-12-07 (화), 10:30 -0600, James Bottomley:
> On Wed, 2010-12-08 at 01:12 +0900, Namhyung Kim wrote:
> > MODULE_DEVICE_TABLE expands to nop when !MODULE (not !CONFIG_MODULE) so
> > allyesconfig build always emits the warnings. Possible patch for this
> > would be wraping it up in #ifdefs but when I sent a same patch to Greg
> > KH he didn't want to add more #ifdefs in .c files.
> 
> I didn't mean changing any c files.  I meant fixing the module include
> to make the table used even in the !MODULE case.  That way we only alter
> one file instead of a significant proportion of the drivers.
> 

It would not be a _significant_ proportion because normal drivers may
refer the table in their driver struct. :)

Anyway the patch below looks good to me. I'll happily drop my patches if
you apply this in your tree.

Thanks.

> 
> diff --git a/include/linux/module.h b/include/linux/module.h
> index 7575bbb..d49aa9c 100644
> --- a/include/linux/module.h
> +++ b/include/linux/module.h
> @@ -90,7 +90,10 @@ extern const struct gtype##_id __mod_##gtype##_table		\
>  extern struct module __this_module;
>  #define THIS_MODULE (&__this_module)
>  #else  /* !MODULE */
> -#define MODULE_GENERIC_TABLE(gtype,name)
> +/* Flag name as used to avoid warnings about the unused device id table */
> +#define MODULE_GENERIC_TABLE(gtype,name)			\
> +static const struct gtype##_id __mod_##gtype##_table		\
> +  __attribute__ ((unused, alias(__stringify(name))))
>  #define THIS_MODULE ((struct module *)0)
>  #endif
>  


-- 
Regards,
Namhyung Kim


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