Re: [PATCH] __devexit_p macro

From: Dave Jones (davej@suse.de)
Date: Fri Aug 02 2002 - 07:33:49 EST


On Fri, Aug 02, 2002 at 09:24:56AM +0000, Felipe W Damasio wrote:
> --- ./include/linux/init.h.orig Fri Aug 2 09:15:44 2002
> +++ ./include/linux/init.h Fri Aug 2 09:06:39 2002
> @@ -177,12 +177,16 @@
> #define __devinitdata
> #define __devexit
> #define __devexitdata
> -#define __devexit_p(x) &(x)
> #else
> #define __devinit __init
> #define __devinitdata __initdata
> #define __devexit __exit
> #define __devexitdata __exitdata
> +#endif
> +
> +#ifdef MODULE || CONFIG_HOTPLUG
> +#define __devexit_p(x) &(x)
> +#else
> #define __devexit_p(x) 0
> #endif

Instead of making this a maze of #if/else's, you can acheive
the same effect with the following patch that has been in my
tree for a few months.. (hand pasted, may not apply cleanly)

@@ -167,12 +167,18 @@ typedef void (*__cleanup_module_func_t)(
 #define device_initcall(fn) module_init(fn)
 #define late_initcall(fn) module_init(fn)

-#endif
+#endif /* !MODULE */

 /* Data marked not to be saved by software_suspend() */
 #define __nosavedata __attribute__ ((__section__ (".data.nosave")))

-#ifdef CONFIG_HOTPLUG
+/* Functions marked as __devexit may be discarded at kernel link time, depending
+ on config options. Newer versions of binutils detect references from
+ retained sections to discarded sections and flag an error. Pointers to
+ __devexit functions must use __devexit_p(function_name), the wrapper will
+ insert either the function_name or NULL, depending on the config options.
+ */
+#if defined(MODULE) || defined(CONFIG_HOTPLUG)
 #define __devinit
 #define __devinitdata
 #define __devexit

-- 
| Dave Jones.        http://www.codemonkey.org.uk
| SuSE Labs
-
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