linux-kernel - Re: [PATCH 1/3] module: deal with alignment issues in built-in module versions

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Message-ID: <20110221074947.GA31152@dtor-ws.eng.vmware.com>
Date:	Sun, 20 Feb 2011 23:49:47 -0800
From:	Dmitry Torokhov <dtor@...are.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Miller <davem@...emloft.net>,
	linux-kernel@...r.kernel.org, linux-m68k@...r.kernel.org,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH 1/3] module: deal with alignment issues in built-in
 module versions

On Mon, Feb 21, 2011 at 08:38:46AM +0100, Geert Uytterhoeven wrote:
> On Mon, Feb 21, 2011 at 05:00, Rusty Russell <rusty@...tcorp.com.au> wrote:
> >> Except that .long is 32-bit on ppc64 :-( You need .llong for 64-bit.
> >
> > OK, all options suck.  Do we want the workaround or not?
> 
> We can discuss about that until someone gets bitten by that.
> 
> But please fix the "aligned(sizeof(void *))"-in-one-place-only issue.
> 

How about this one then?

Thanks.

-- 
Dmitry

>From f0e0e10b58b22047e36e21a022abf5e86b5819c2 Mon Sep 17 00:00:00 2001
From: Dmitry Torokhov <dtor@...are.com>
Date: Fri, 4 Feb 2011 13:30:10 -0800
Subject: [PATCH] module: explicitly align module_version_attribute structure

We force particular alignment when we generate attribute structures
when generation MODULE_VERSION() data and we need to make sure that
this alignment is followed when we iterate over these structures,
otherwise we may crash on platforms whose natural alignment is not
sizeof(void *), such as m68k.

Reported-by: Geert Uytterhoeven <geert@...ux-m68k.org>
Signed-off-by: Dmitry Torokhov <dtor@...are.com>
---
 include/linux/module.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/include/linux/module.h b/include/linux/module.h
index e7c6385..de5cd21 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -62,7 +62,7 @@ struct module_version_attribute {
 	struct module_attribute mattr;
 	const char *module_name;
 	const char *version;
-};
+} __attribute__ ((__aligned__(sizeof(void *))));
 
 struct module_kobject
 {
-- 
1.7.3.2

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