From: Arnd Bergmann <arnd@arndb.de>
To: Andi Kleen <ak@suse.de>
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
sam@ravnborg.org, rusty@rustcorp.com.au
Subject: Re: [PATCH RFC] [1/9] Core module symbol namespaces code and intro.
Date: Thu, 29 Nov 2007 10:55:01 +0100 [thread overview]
Message-ID: <200711291055.02056.arnd@arndb.de> (raw)
In-Reply-To: <20071122343.446909000@suse.de>
On Thursday 22 November 2007, Andi Kleen wrote:
> #define EXPORT_SYMBOL(sym) \
> - __EXPORT_SYMBOL(sym, "")
> + __EXPORT_SYMBOL(sym, "",,, NULL)
>
> #define EXPORT_SYMBOL_GPL(sym) \
> - __EXPORT_SYMBOL(sym, "_gpl")
> + __EXPORT_SYMBOL(sym, "_gpl",,, NULL)
>
> #define EXPORT_SYMBOL_GPL_FUTURE(sym) \
> - __EXPORT_SYMBOL(sym, "_gpl_future")
> + __EXPORT_SYMBOL(sym, "_gpl_future",,, NULL)
>
> +/* Export symbol into namespace ns
> + * No _GPL variants because namespaces imply GPL only
> + */
> +#define EXPORT_SYMBOL_NS(ns, sym) \
> + __EXPORT_SYMBOL(sym, "_gpl",__##ns, NS_SEPARATOR #ns, #ns)
>
I think it would be good if you could specify a default namespace
per module, that could reduce the amount of necessary changes significantly.
For example, you can do
#define EXPORT_SYMBOL_GLOBAL(sym) __EXPORT_SYMBOL(sym, "_gpl",,, NULL)
#ifdef MODULE_NAMESPACE
#define EXPORT_SYMBOL_GPL(sym) EXPORT_SYMBOL_GLOBAL(sym)
#else
#define EXPORT_SYMBOL_GPL(sym) EXPORT_SYMBOL_NS(sym, MODULE_NAMESPACE)
#endif
If we go that way, it may be useful to extend the namespace mechanism to
non-GPL symbols as well, like
#define EXPORT_SYMBOL(sym) __EXPORT_SYMBOL(sym, "",__## MODULE_NAMESPACE, NS_SEPARATOR #MODULE_NAMESPACE, #MODULE_NAMESPACE)
Unfortunately, doing this automatic namespace selection requires to set
the namespace before #include <linux/module.h>. One way to work around this
could be to use Makefile magic so you can list a Makefile as
obj-$(CONFIG_COMBINED) += combined.o
combined-$(CONFIG_SUBOPTION) += combined_main.o combined_other.o
obj-$(CONFIG_SINGLE) += single.o
obj-$(CONFIG_OTHER) += other.o
obj-$(CONFIG_API) += api.o
NAMESPACE = subsys # default, used for other.o
NAMESPACE_single.o = single # used only for single.o
NAMESPACE_combined.o = combined # all parts of combined.o
NAMESPACE_combined_other.o = special # except this one
NAMESPACE_api.o = # api.o is put into the global ns
The Makefile logic here would basically just follow the rules we have for
CFLAGS etc, and then pass -DMODULE_NAMESPACE=$(NAMESPACE_$(obj)) to gcc.
Arnd <><
next prev parent reply other threads:[~2007-11-29 9:55 UTC|newest]
Thread overview: 83+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-22 2:43 [PATCH RFC] [1/9] Core module symbol namespaces code and intro Andi Kleen
2007-11-22 2:43 ` [PATCH RFC] [2/9] Fix duplicate symbol check to also check future gpl and unused symbols Andi Kleen
2007-11-22 2:43 ` [PATCH RFC] [3/9] modpost: Declare the modpost error functions as printf like Andi Kleen
2007-12-10 18:50 ` Sam Ravnborg
2007-12-10 18:58 ` Andi Kleen
2007-12-12 1:37 ` Rusty Russell
2007-11-22 2:43 ` [PATCH RFC] [4/9] modpost: Fix format string warnings Andi Kleen
2007-12-10 18:50 ` Sam Ravnborg
2007-11-22 2:43 ` [PATCH RFC] [5/9] modpost: Fix a buffer overflow in modpost Andi Kleen
2007-12-10 19:32 ` Sam Ravnborg
2007-12-10 19:57 ` Andi Kleen
2007-12-10 20:07 ` Sam Ravnborg
2007-11-22 2:43 ` [PATCH RFC] [6/9] Implement namespace checking " Andi Kleen
2007-11-22 2:43 ` [PATCH RFC] [7/9] Convert TCP exports into namespaces Andi Kleen
2007-11-22 2:43 ` [PATCH RFC] [8/9] Put UDP exports into a namespace Andi Kleen
2007-11-22 2:43 ` [PATCH RFC] [9/9] Add a inet namespace Andi Kleen
2007-11-22 3:03 ` [PATCH RFC] [1/9] Core module symbol namespaces code and intro Arjan van de Ven
2007-11-22 3:37 ` Andi Kleen
2007-11-22 3:52 ` Dave Jones
2007-11-22 3:56 ` Rusty Russell
2007-11-22 8:41 ` Dave Young
2007-11-22 18:19 ` Andi Kleen
2007-11-23 2:06 ` Dave Young
2007-11-22 11:05 ` Christoph Hellwig
2007-11-23 0:25 ` Rusty Russell
2007-11-23 1:36 ` Andi Kleen
2007-11-23 3:35 ` Rusty Russell
2007-11-23 19:53 ` Andi Kleen
2007-11-24 4:53 ` Rusty Russell
2007-11-24 12:39 ` Andi Kleen
2007-11-26 1:23 ` Rusty Russell
2007-11-22 11:46 ` Andi Kleen
2007-11-23 0:29 ` Rusty Russell
2007-11-25 20:29 ` Roland Dreier
2007-11-26 1:25 ` Rusty Russell
2007-11-26 5:58 ` Roland Dreier
2007-11-27 4:26 ` Rusty Russell
2007-11-27 10:50 ` Andi Kleen
2007-11-27 13:58 ` Herbert Xu
2007-11-27 14:12 ` Andi Kleen
2007-11-27 14:36 ` Herbert Xu
2007-11-27 20:02 ` Valdis.Kletnieks
2007-11-28 1:34 ` Rusty Russell
2007-11-22 11:06 ` Christoph Hellwig
2007-11-22 11:54 ` Andi Kleen
2007-11-22 12:03 ` Christoph Hellwig
2007-11-22 12:01 ` Arnaldo Carvalho de Melo
2007-11-22 18:17 ` Andi Kleen
2007-11-25 20:27 ` Roland Dreier
2007-11-26 1:28 ` Rusty Russell
2007-11-26 6:15 ` Roland Dreier
2007-11-27 4:49 ` Rusty Russell
2007-11-27 5:35 ` Tom Tucker
2007-11-27 9:02 ` Andi Kleen
2007-11-27 17:24 ` Adrian Bunk
2007-11-27 17:15 ` Adrian Bunk
2007-11-27 17:45 ` Tom Tucker
2007-11-27 18:59 ` Adrian Bunk
2007-11-28 1:27 ` Rusty Russell
2007-11-28 4:12 ` Tom Tucker
2007-11-27 15:43 ` Jonathan Corbet
2007-11-27 15:58 ` Andi Kleen
2007-11-27 16:33 ` Christoph Hellwig
2007-11-27 22:31 ` Jon Masters
2007-11-27 22:37 ` Andi Kleen
2007-11-27 23:00 ` Stephen Hemminger
2007-11-27 23:06 ` Andi Kleen
2007-11-28 16:48 ` Adrian Bunk
2007-11-28 17:31 ` Andi Kleen
2007-11-26 18:25 ` Stephen Hemminger
2007-11-26 22:18 ` Roland Dreier
2007-11-27 19:00 ` Dave Jones
2007-11-27 21:09 ` Adrian Bunk
2007-11-27 21:15 ` Rick Jones
2007-11-27 21:38 ` Adrian Bunk
2007-11-28 2:01 ` Rick Jones
2007-11-27 21:25 ` Dave Jones
2007-11-27 23:00 ` Valdis.Kletnieks
2007-11-29 16:53 ` Arjan van de Ven
2007-11-30 2:18 ` Rusty Russell
2007-11-29 9:55 ` Arnd Bergmann [this message]
2007-11-29 10:00 ` Andi Kleen
2007-11-29 10:21 ` Arnd Bergmann
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