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

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Date:	Fri, 5 Jun 2015 22:39:00 +0100
From:	James Hogan <james.hogan@...tec.com>
To:	Guenter Roeck <linux@...ck-us.net>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
CC:	<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'

On Fri, Jun 05, 2015 at 01:40:55PM -0700, Guenter Roeck wrote:
> My qemu metag runtime test fails in -next due to commit 5ebbb3badaa8 ("module:
> relocate module_init from init.h to module.h"). Bisect log is as follows.
> A log of a failed test is available at
> http://server.roeck-us.net:8010/builders/qemu-metag-next/builds/173/steps/qemubuildcommand/logs/stdio
> 
> Essentially the test just hangs in boot.
> 
> Reverting the commit fixes the problem.

Thanks for finding and bisecting Guenter!

Some build warnings from the same commit caught my eye, which made it a
quick one to figure out. Paul, please consider applying the patch below
before the offending commit "module: relocate module_init from init.h to
module.h", so as not to break bisection.

Cheers
James

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
---
 drivers/tty/metag_da.c | 20 +-------------------
 1 file changed, 1 insertion(+), 19 deletions(-)

diff --git a/drivers/tty/metag_da.c b/drivers/tty/metag_da.c
index 3774600741d8..9325262289f9 100644
--- a/drivers/tty/metag_da.c
+++ b/drivers/tty/metag_da.c
@@ -640,25 +640,7 @@ err_destroy_ports:
 	put_tty_driver(channel_driver);
 	return ret;
 }
-
-static void dashtty_exit(void)
-{
-	int nport;
-	struct dashtty_port *dport;
-
-	del_timer_sync(&put_timer);
-	kthread_stop(dashtty_thread);
-	del_timer_sync(&poll_timer);
-	tty_unregister_driver(channel_driver);
-	for (nport = 0; nport < NUM_TTY_CHANNELS; nport++) {
-		dport = &dashtty_ports[nport];
-		tty_port_destroy(&dport->port);
-	}
-	put_tty_driver(channel_driver);
-}
-
-module_init(dashtty_init);
-module_exit(dashtty_exit);
+device_initcall(dashtty_init);
 
 #ifdef CONFIG_DA_CONSOLE
 
-- 
2.3.6


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