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

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Date:	Tue, 07 Dec 2010 10:30:49 -0600
From:	James Bottomley <James.Bottomley@...e.de>
To:	Namhyung Kim <namhyung@...il.com>
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

On Wed, 2010-12-08 at 01:12 +0900, Namhyung Kim wrote:
> 2010-12-07 (화), 09:57 -0600, James Bottomley:
> > Um so this is definitely used in the MODULE_DEVICE_TABLE just below.
> > 
> > I deduce you have some type of config which causes that to be a nop
> > (say !CONFIG_MODULE)?  In which case, surely the correct fix is in
> > module.h?
> > 
> 
> Hi,
> 
> 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.

James

---

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
 



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