module: fix BUG_ON() for powerpc (and other function descriptor archs)
Rusty Russell [Wed, 26 Aug 2009 12:32:54 +0000 (21:32 +0930)]
The rarely-used symbol_put_addr() needs to use dereference_function_descriptor
on powerpc.

Reported-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/module.c

index fd14114..07c80e6 100644 (file)
@@ -909,16 +909,18 @@ void __symbol_put(const char *symbol)
 }
 EXPORT_SYMBOL(__symbol_put);
 
+/* Note this assumes addr is a function, which it currently always is. */
 void symbol_put_addr(void *addr)
 {
        struct module *modaddr;
+       unsigned long a = (unsigned long)dereference_function_descriptor(addr);
 
-       if (core_kernel_text((unsigned long)addr))
+       if (core_kernel_text(a))
                return;
 
        /* module_text_address is safe here: we're supposed to have reference
         * to module from symbol_get, so it can't go away. */
-       modaddr = __module_text_address((unsigned long)addr);
+       modaddr = __module_text_address(a);
        BUG_ON(!modaddr);
        module_put(modaddr);
 }