linux-kernel - Re: metag test failure in -next due to commit 'module: relocate module

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Message-ID: <20150607221727.GA7125@windriver.com>
Date:	Sun, 7 Jun 2015 18:17:28 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	Guenter Roeck <linux@...ck-us.net>
CC:	James Hogan <james.hogan@...tec.com>,
	<linux-kernel@...r.kernel.org>, <linux-metag@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>
Subject: Re: metag test failure in -next due to commit 'module: relocate
 module_init from init.h to module.h'

[Re: metag test failure in -next due to commit 'module: relocate module_init from init.h to module.h'] On 05/06/2015 (Fri 17:39) Guenter Roeck wrote:

> On 06/05/2015 02:39 PM, James Hogan wrote:
> [ ... ]
> >
> > From e12856c559d7dff2ad4f6497996610e12e7c7e2d Mon Sep 17 00:00:00 2001
> >From: James Hogan <james.hogan@...tec.com>
> >Date: Fri, 5 Jun 2015 22:17:18 +0100
> >Subject: [PATCH] tty/metag_da: Avoid module_init/module_exit
> >MIME-Version: 1.0
> >Content-Type: text/plain; charset=UTF-8
> >Content-Transfer-Encoding: 8bit
> >
> >The metag_da TTY driver can't get built as a module at the moment, but
> >it still uses module_init() and module_exit(). Those macros are moving
> >to module.h which isn't included by metag_da.c, which will result in the
> >following build warnings (remarkably no build errors) and an apparent
> >failure to boot as the TTY driver won't be loaded.
> >
> >drivers/tty/metag_da.c:660: warning: data definition has no type or storage class
> >drivers/tty/metag_da.c:660: warning: type defaults to ‘int’ in declaration of ‘module_init’
> >drivers/tty/metag_da.c:660: warning: parameter names (without types) in function declaration
> >drivers/tty/metag_da.c:661: warning: data definition has no type or storage class
> >drivers/tty/metag_da.c:661: warning: type defaults to ‘int’ in declaration of ‘module_exit’
> >drivers/tty/metag_da.c:661: warning: parameter names (without types) in function declaration
> >drivers/tty/metag_da.c:572: warning: ‘dashtty_init’ defined but not used
> >drivers/tty/metag_da.c:645: warning: ‘dashtty_exit’ defined but not used
> >drivers/tty/metag_da.c In function ‘dash_console_write’:
> >drivers/tty/metag_da.c:670 : warning: passing argument 4 of ‘chancall’ discards qualifiers from pointer target type
> >
> >Instead of just adding the module.h include, now would be a good time to
> >remove the use of these macros, replacing the module_init with
> >device_initcall, and removing the exit function altogether since it
> >isn't needed. If module support is added later the code can always be
> >resurrected.
> >
> >Reported-by: Guenter Roeck <linux@...ck-us.net>
> >Signed-off-by: James Hogan <james.hogan@...tec.com>
> >Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> >Cc: Jiri Slaby <jslaby@...e.cz>
> >Cc: Paul Gortmaker <paul.gortmaker@...driver.com>
> >Cc: linux-metag@...r.kernel.org
> 
> Yes, that does the trick.
> 
> Tested-by: Guenter Roeck <linux@...ck-us.net>

Thanks guys, I'll add that to the module_init-device_initcall conversion
branch, which will put it ahead of the code relocation commit.

I think most other arch run with -Werror-implicit (or whatever it is) so
that these kinds of things would not "leak" past into a silent boot
fail like this.

Paul.
--

> 
> Thanks,
> Guenter
> 
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