Is my way correct to use EXPORT_SYMBOL_NOVERS(name) ?

cranium2004 · 03-04-2005, 01:00 AM

hello,
Is EXPORT_SYMBOL_NOVERS(name) when used on variable symbol name allows to use exported symbol irrespective of kernel version on which its compiled and in which its inserted?
That mean does that give flexibility of having symbols inserted to any kernel version without giving unresolved symbol error?

Wayne Sallee · 12-25-2014, 12:50 PM

That's a good question. Now that it has been 10 years, anyone have an answer?

Wayne Sallee
Wayne@WayneSallee.com

NevemTeve · 12-25-2014, 11:53 PM

Are you referring to some context, or just talking in general?

Wayne Sallee · 12-26-2014, 07:14 AM

I've been downloading kernels from kernel.org, and building them over the years, and am tired of having to use force to load modules.

Wayne Sallee
Wayne@WayneSallee.com

NevemTeve · 12-26-2014, 08:43 AM

You mean you're using modules from external sources?

mina86 · 12-26-2014, 10:49 AM

There is no EXPORT_SYMBOL_NOVERS in current kernel and the fact that you have to force module loading makes perfect sense – the same symbol may have completely different type between versions of the kernel, so loading module built for a different kernel may cause a crash. Build modules whenever you build a new kernel, stick to the kernel given modules were built for or live with the fact that kernel will warn you that you're not only pointed the gun at your foot but even pulled the trigger – let's hope bullet was not in the chamber.

Wayne Sallee · 12-26-2014, 01:41 PM

Quote:

Originally Posted by NevemTeve

You mean you're using modules from external sources?

Yes I guess. New drivers are installed, and new kernels are built.

Wayne Sallee
Wayne@WayneSallee.com

kevinmilan2014 · 12-30-2014, 12:25 AM

--- linux-2.6.10-rc2-bk11-Module.orig/include/linux/module.h 2004-11-29 07:48:57.000000000 +1100
+++ linux-2.6.10-rc2-bk11-Module/include/linux/module.h 2004-11-29 09:39:31.970206608 +1100
@@ -206,10 +206,6 @@

#endif

-/* We don't mangle the actual symbol anymore, so no need for
- * special casing EXPORT_SYMBOL_NOVERS. FIXME: Deprecated */
-#define EXPORT_SYMBOL_NOVERS(sym) EXPORT_SYMBOL(sym)
-

Code:

 struct module_ref
 {
 	local_t count;
@@ -449,7 +445,6 @@
 #else /* !CONFIG_MODULES... */
 #define EXPORT_SYMBOL(sym)
 #define EXPORT_SYMBOL_GPL(sym)
-#define EXPORT_SYMBOL_NOVERS(sym)

/* Given an address, look for it in the exception tables. */
static inline const struct exception_table_entry *